Making Cold Brew Coffee Using Tupperware Containers

Quick answer

• Use a fine-mesh strainer or cheesecloth to filter your cold brew.
• Aim for a coffee-to-water ratio between 1:4 and 1:8 for a concentrate.
• Coarse grounds are best for cold brew to prevent over-extraction and sediment.
• Let the coffee steep for 12-24 hours at room temperature or in the refrigerator.
• Dilute your cold brew concentrate with water or milk to your preferred taste.
• Ensure your Tupperware containers are clean and odor-free before starting.

Who this is for

• Home coffee enthusiasts looking for a simple, budget-friendly cold brew method.
• Those who have Tupperware containers and want to repurpose them for brewing.
• Individuals who prefer a less acidic, smoother coffee taste.

What to check first

Brewer type and filter type

For this method, your “brewer” is simply a Tupperware container. The crucial element is your filtration system. You’ll need something to separate the coffee grounds from the liquid after steeping. Options include fine-mesh strainers, cheesecloth, or even a clean coffee filter (though this can be slow). Ensure your chosen filter is clean and doesn’t impart any unwanted flavors.

Water quality and temperature

Start with filtered water for the best taste. Tap water can contain minerals or chlorine that affect the final flavor of your cold brew. While cold brew is brewed cold, the initial steeping temperature can influence extraction. Many people steep at room temperature (around 68-72°F), which works well. Steeping in the refrigerator (around 40°F) will result in a slower extraction, potentially requiring a longer steep time.

Grind size and coffee freshness

Use coarsely ground coffee. This is essential for cold brew. Fine grounds can pass through your filter, creating sediment and a muddy texture. They can also over-extract, leading to a bitter taste. Freshly ground beans will always yield the best flavor, but for cold brew, even pre-ground coffee can work if it’s coarse. Aim to grind your beans just before brewing if possible.

Coffee-to-water ratio

The ratio of coffee to water is key to the strength of your cold brew. For a concentrate, a common starting point is 1:4 to 1:8 (e.g., 1 cup of coffee grounds to 4-8 cups of water). This concentrate will then be diluted. If you prefer a less intense brew that’s ready to drink, you might use a ratio closer to 1:10 or 1:12. Experiment to find your ideal strength.

Cleanliness/descale status

Before you begin, make sure your Tupperware containers and any brewing equipment (like strainers) are thoroughly cleaned. Residual oils or odors from previous meals can transfer to your coffee, ruining the flavor. If you use a coffee maker for hot coffee regularly, ensure it’s descaled, though this is less critical for a cold brew method using containers.

Step-by-step (brew workflow)

1. Gather your supplies. You’ll need a clean Tupperware container with a lid, coarsely ground coffee, filtered water, and a filtering method (fine-mesh strainer, cheesecloth, etc.).

• What “good” looks like: All items are clean and ready for use.
• Common mistake: Using a container that smells like old food. Avoid this by washing thoroughly with soap and water, and rinsing well.

2. Add coffee grounds to the container. Measure your coffee grounds based on your desired ratio. For a concentrate, start with 1 part coffee to 4-8 parts water.

• What “good” looks like: The grounds are evenly distributed at the bottom of the container.
• Common mistake: Using too fine a grind. Avoid this by ensuring your grinder is set to a coarse setting, similar to breadcrumbs.

3. Pour in the water. Slowly pour your filtered water over the coffee grounds. Ensure all grounds are saturated.

• What “good” looks like: All the coffee grounds are wet and begin to clump together.
• Common mistake: Pouring water too quickly, which can cause grounds to float and not saturate evenly. Avoid this by pouring slowly in a circular motion.

4. Stir gently. Give the mixture a gentle stir to ensure all coffee grounds are submerged and fully incorporated with the water.

• What “good” looks like: A uniform slurry of coffee and water, with no dry pockets of grounds.
• Common mistake: Over-stirring, which can break down grounds and lead to a muddier brew. Avoid this by stirring just enough to saturate everything.

5. Cover the container. Securely place the lid on your Tupperware container.

• What “good” looks like: The container is sealed, preventing evaporation and contamination.
• Common mistake: Leaving the container uncovered. Avoid this by ensuring the lid is tightly sealed.

6. Steep the coffee. Place the container in a cool, dark place. Room temperature (68-72°F) or the refrigerator are common choices.

• What “good” looks like: The container is undisturbed, allowing the coffee to extract slowly.
• Common mistake: Moving or shaking the container frequently. Avoid this by setting it aside and letting it steep undisturbed.

7. Steep for the recommended time. Allow the coffee to steep for 12 to 24 hours. Longer steeping times generally result in a stronger, more concentrated brew.

• What “good” looks like: The coffee has had ample time to extract its flavor.
• Common mistake: Under-steeping (e.g., 6 hours), which results in weak, watery coffee. Avoid this by adhering to the 12-24 hour window.

8. Prepare for filtering. Set up your filtering station. Place a fine-mesh strainer over another clean container or pitcher. If using cheesecloth, line the strainer with it.

• What “good” looks like: Your filtering setup is ready to catch the grounds efficiently.
• Common mistake: Not having a large enough receiving container. Avoid this by ensuring your second container can hold the full volume of liquid.

9. Strain the coffee. Slowly pour the steeped coffee mixture through the strainer into the clean container. Allow gravity to do the work.

• What “good” looks like: The liquid is flowing through, leaving the grounds behind.
• Common mistake: Pouring too quickly, which can overwhelm the filter and cause grounds to escape. Avoid this by pouring in stages and letting the liquid drain.

10. Double-filter if necessary. For an even clearer brew, you can pour the strained coffee through the filter a second time, or use a coffee filter lined in your strainer.

• What “good” looks like: The coffee is free of significant sediment.
• Common mistake: Rushing the second filtering. Avoid this by being patient, as this step can be slow.

11. Store the concentrate. Pour your finished cold brew concentrate into a clean, airtight container and store it in the refrigerator.

• What “good” looks like: The concentrate is stored safely and will remain fresh.
• Common mistake: Storing in an open container. Avoid this by using a lid to prevent oxidation and absorption of fridge odors.

12. Dilute and serve. When ready to drink, dilute your cold brew concentrate with water, milk, or your preferred creamer. A common starting point is a 1:1 ratio of concentrate to water/milk, but adjust to taste.

• What “good” looks like: A delicious, smooth cup of coffee tailored to your preference.
• Common mistake: Drinking the concentrate straight. Avoid this by remembering it’s a concentrate and needs dilution.

Common mistakes (and what happens if you ignore them)

Mistake	What it causes	Fix
Using fine coffee grounds	Sediment in your brew, muddy texture, over-extraction, bitterness	Use coarse grounds (like sea salt).
Not steeping long enough	Weak, watery coffee with underdeveloped flavor	Steep for 12-24 hours.
Over-steeping	Bitter, overly strong, and sometimes metallic taste	Steep for 12-24 hours; longer can lead to bitterness.
Using tap water	Off-flavors from chlorine or minerals affecting coffee taste	Use filtered or bottled water.
Not cleaning the container thoroughly	Unpleasant odors and flavors transferred to the coffee	Wash containers thoroughly with soap and water, and rinse well.
Using too much coffee	Over-extraction, bitterness, and a waste of coffee	Start with a 1:4 to 1:8 ratio for concentrate and adjust.
Using too little coffee	Weak, watery coffee that lacks flavor	Start with a 1:4 to 1:8 ratio for concentrate and adjust.
Not stirring the grounds initially	Uneven extraction, with some grounds under-extracted and others over-extracted	Gently stir to ensure all grounds are saturated.
Not filtering properly	Grounds and sediment in your final cup	Use a fine-mesh strainer, cheesecloth, or a coffee filter for a cleaner brew.
Storing concentrate uncovered	Oxidation, loss of flavor, and absorption of fridge odors	Store in an airtight container in the refrigerator.
Drinking the concentrate straight	Overwhelmingly strong, bitter, and unpleasant taste	Dilute with water, milk, or your preferred beverage to taste.

Decision rules (simple if/then)

• If your cold brew tastes weak, then increase the coffee-to-water ratio for your next batch because more coffee grounds will extract more flavor.
• If your cold brew tastes bitter, then try a coarser grind or a shorter steep time because over-extraction causes bitterness.
• If you have sediment in your cup, then use a finer filter (like cheesecloth over a strainer) or double-filter because fine grounds are escaping.
• If your cold brew has an off-flavor, then ensure your container and equipment are thoroughly cleaned because residual food particles can impart unwanted tastes.
• If you prefer a smoother taste, then use filtered water because tap water can introduce flavors that affect the final brew.
• If you want a stronger brew, then steep for a longer period (up to 24 hours) because longer contact time extracts more from the coffee.
• If you are in a hurry, then accept that cold brew requires patience; a shorter steep time will result in a weaker flavor, but won’t be true cold brew.
• If you notice a metallic taste, then try reducing your steep time or using a different type of coffee because over-extraction can sometimes lead to metallic notes.
• If your coffee grounds are floating, then stir them gently to ensure they are all submerged because full saturation is key to even extraction.
• If you want to experiment with flavor, then try different coffee beans, but always start with the correct grind size and ratio for cold brew.

FAQ

What is the best coffee bean for cold brew?

While any coffee bean can be used, medium to dark roasts are often favored for their richer, chocolatey, or nutty notes that shine in cold brew. Lighter roasts might not extract as fully, resulting in a less intense flavor.

How long does cold brew concentrate last?

Cold brew concentrate stored in an airtight container in the refrigerator typically lasts for about 7 to 10 days. However, its flavor may start to degrade after about a week.

Can I use pre-ground coffee for cold brew?

Yes, you can use pre-ground coffee, but it’s crucial that it’s ground coarsely. If you can only find pre-ground coffee, opt for a “percolator” or “French press” grind.

Why is my cold brew cloudy?

Cloudiness is usually due to fine coffee particles passing through your filter. This can happen if your grind is too fine, your filter isn’t fine enough, or you poured too quickly during the straining process.

How do I make cold brew less acidic?

Cold brew is naturally less acidic than hot-brewed coffee due to the brewing method. If it’s still too acidic for you, try a longer steep time, a coarser grind, or a darker roast coffee.

Can I reheat cold brew?

Yes, you can gently reheat cold brew if you prefer it warm. However, be careful not to boil it, as this can alter the flavor profile. Microwaving or gentle stovetop heating are options.

What does “concentrate” mean for cold brew?

Cold brew concentrate is a highly concentrated form of cold brew coffee. It’s made with a higher coffee-to-water ratio and is meant to be diluted with water, milk, or ice before drinking.

Is cold brew healthier than hot coffee?

Cold brew is generally considered to be less acidic, which can be easier on the stomach for some people. The health benefits are largely similar to hot coffee, depending on what you add to it.

What this page does NOT cover (and where to go next)

• Specific coffee bean recommendations and tasting notes. (Explore coffee bean reviews and origin guides.)
• Advanced filtration techniques beyond basic home methods. (Look into specialized cold brew makers or commercial filters.)
• Detailed explanations of coffee extraction chemistry. (Research coffee science articles or brewing forums.)