How To Make Coffee In Tea Bags For Brewing

Quick answer

• Use a fine-mesh tea infuser or a DIY paper filter bag.
• Grind your coffee beans to a medium-fine consistency.
• Preheat your mug and brewing vessel.
• Bloom the coffee grounds for 30 seconds.
• Pour hot water slowly in stages.
• Let it steep for 4-5 minutes.
• Remove the coffee bag and enjoy.

Who this is for

• Campers and travelers who need a portable brewing method.
• Anyone without a coffee maker looking for a simple brew.
• Those who enjoy experimenting with different brewing techniques.

What to check first

Brewer type and filter type

This method is all about the “bag.” You’re essentially creating your own single-serve coffee pouch. Think of it like a giant tea bag, but for coffee. If you’re using a pre-made tea infuser, make sure it’s clean and large enough to hold your coffee grounds. If you’re going the DIY route with a paper filter, ensure it’s a sturdy, unbleached one. I usually keep a few disposable paper filters tucked away for just this kind of situation.

Water quality and temperature

Water is a huge part of coffee flavor. Use filtered water if you can. Tap water can sometimes have off-flavors that will mess with your brew. Aim for water just off the boil, around 195-205°F (90-96°C). Too hot, and you’ll scorch the grounds. Too cool, and you won’t extract enough flavor. A quick way to get close is to boil water and then let it sit for about 30-60 seconds.

Grind size and coffee freshness

Freshly ground coffee is key. It makes a world of difference. For this method, a medium-fine grind works best. It’s finer than what you’d use for a French press, but not as fine as espresso. Think coarse sand. If your grind is too fine, you’ll get a muddy, over-extracted cup. Too coarse, and it’ll be weak and sour.

Coffee-to-water ratio

A good starting point is a ratio of 1:15 to 1:17. That means for every gram of coffee, you use 15 to 17 grams of water. A common measurement is about 2 tablespoons (around 10-12 grams) of coffee for every 6 ounces (about 180 ml) of water. You can adjust this to your taste, but this gives you a solid baseline.

Cleanliness/descale status

This applies to your mug and any equipment you use. Make sure everything is clean. Old coffee residue can make your fresh brew taste stale or bitter. If you’ve got a reusable infuser, give it a good scrub. It’s a simple step, but it prevents a lot of potential flavor issues.

Step-by-step (brew workflow)

1. Prepare your “coffee bag.”

• What to do: Take a large, unbleached paper coffee filter. Fold it in half, then fold the sides in to create a pouch. You can staple or fold the top shut, or just leave it open to fill. Alternatively, use a large, clean tea infuser.
• What “good” looks like: A secure pouch or an open infuser ready to be filled.
• Common mistake: Not securing the bag well, leading to grounds escaping into your cup. Make sure it’s sealed or you can easily close it.

2. Measure your coffee.

• What to do: Weigh or scoop your desired amount of coffee grounds into the bag or infuser. Aim for that 1:15 to 1:17 ratio we talked about.
• What “good” looks like: The correct amount of coffee, evenly distributed.
• Common mistake: Using too much or too little coffee. Too much results in bitterness, too little in weakness.

3. Seal your bag (if using paper).

• What to do: If you’re using a DIY paper filter bag, gently fold or staple the top closed to keep the grounds contained.
• What “good” looks like: A sealed bag that won’t spill grounds.
• Common mistake: Leaving the bag too open, allowing grounds to escape during brewing.

4. Place the bag in your mug.

• What to do: Put your prepared coffee bag or infuser into your mug. Make sure it can hang or sit without falling in completely.
• What “good” looks like: The bag is stable in the mug, ready for water.
• Common mistake: Not having a mug that can hold the bag securely. A wide-mouthed mug is best.

5. Heat your water.

• What to do: Heat your filtered water to the optimal temperature (195-205°F or 90-96°C).
• What “good” looks like: Water that’s hot but not boiling.
• Common mistake: Using boiling water, which can burn the coffee and create bitter flavors.

6. Bloom the coffee.

• What to do: Pour just enough hot water over the grounds to saturate them. Let it sit for 30 seconds. You’ll see the grounds puff up and release CO2.
• What “good” looks like: The coffee “blooms,” indicating freshness.
• Common mistake: Skipping the bloom. This step is crucial for even extraction and better flavor.

7. Pour the remaining water.

• What to do: Slowly pour the rest of the hot water over the grounds in stages, using a circular motion. Don’t fill the mug to the brim immediately.
• What “good” looks like: Even saturation of the grounds.
• Common mistake: Pouring all the water at once. This can lead to uneven extraction and channeling.

8. Steep the coffee.

• What to do: Let the coffee bag steep in the hot water for about 4-5 minutes. Adjust steeping time based on your grind size and preference.
• What “good” looks like: A rich aroma and a good amount of brewed coffee.
• Common mistake: Steeping for too long or too short. Too long makes it bitter, too short makes it weak.

9. Remove the coffee bag.

• What to do: Carefully lift the coffee bag or infuser out of your mug. Let it drain briefly before discarding or setting aside.
• What “good” looks like: A clean removal without spilling grounds.
• Common mistake: Squeezing the bag too hard. This can release bitter compounds.

10. Serve and enjoy.

• What to do: Add milk, sugar, or enjoy it black.
• What “good” looks like: A delicious cup of coffee.
• Common mistake: Not letting it cool slightly before tasting, leading to a burnt tongue.

Common mistakes (and what happens if you ignore them)

Mistake	What it causes	Fix
Using stale, pre-ground coffee	Weak, flat, and uninteresting flavor.	Always use freshly roasted and ground beans.
Incorrect grind size	Too fine: muddy, bitter cup. Too coarse: weak.	Aim for medium-fine, like coarse sand.
Water too hot or too cold	Scorched flavor (bitter) or under-extracted.	Use water just off the boil (195-205°F).
Skipping the bloom	Uneven extraction, less flavor complexity.	Always bloom for 30 seconds before adding more water.
Over-steeping	Bitter, harsh, and astringent coffee.	Stick to 4-5 minutes, adjusting slightly to taste.
Under-steeping	Weak, sour, and thin-bodied coffee.	Ensure adequate steeping time for proper extraction.
Squeezing the coffee bag	Releases bitter oils and sediment.	Let it drain naturally; don’t force out extra liquid.
Using dirty equipment	Off-flavors, stale coffee taste.	Clean your mug, infuser, and any other tools regularly.
Incorrect coffee-to-water ratio	Too much coffee: bitter. Too little: weak.	Start with 1:15-1:17 and adjust to your preference.
Using poor quality water	Can introduce off-flavors that mask coffee notes.	Use filtered water for a cleaner taste.

Decision rules (simple if/then)

• If your coffee tastes bitter, then reduce the steeping time or use a slightly coarser grind because over-extraction is likely.
• If your coffee tastes weak or sour, then increase the steeping time or use a slightly finer grind because under-extraction is likely.
• If you notice sediment in your cup, then ensure your filter bag is sealed properly or consider a finer grind if using a reusable infuser because grounds are escaping.
• If your coffee has a burnt taste, then check your water temperature; it’s likely too hot.
• If you’re brewing outdoors without a thermometer, then let your boiled water sit for about 30-60 seconds before pouring because this gets you close to the ideal temperature range.
• If you’re using a paper filter and it tears, then you might need a sturdier filter or a gentler pour because the filter isn’t holding up to the water.
• If your coffee tastes muddy, then your grind might be too fine or you’re using too much coffee, leading to over-extraction.
• If you want a bolder cup, then increase the coffee-to-water ratio slightly (e.g., go from 1:17 to 1:15) because you’re using more coffee for the same amount of water.
• If you want a lighter cup, then decrease the coffee-to-water ratio slightly (e.g., go from 1:15 to 1:17) because you’re using less coffee for the same amount of water.
• If you’re in a hurry, then slightly reduce the steeping time, but be aware this might impact flavor extraction.
• If your DIY coffee bag is leaking, then try folding it more securely or using a bit of food-grade tape to seal the edges.

FAQ

Can I reuse a coffee bag?

Generally, no. Coffee grounds are best brewed once for optimal flavor. Reusing them will likely result in a weak and stale-tasting cup.

What kind of paper filter should I use?

Unbleached, natural brown paper filters are a good choice. Avoid anything with added chemicals or scents, as these can transfer to your coffee.

How much coffee should I use for one cup?

A good starting point is about 2 tablespoons (10-12 grams) of coffee for 6 ounces (180 ml) of water. You can adjust this based on your preference for strength.

Can I use a regular tea bag for coffee?

No. Regular tea bags are too small and the mesh is too fine for coffee grounds. They’re designed for tea leaves, not coffee.

What if I don’t have a way to measure water temperature?

Boil your water, then let it sit for about 30-60 seconds before pouring. This usually brings it into the right range for brewing.

Will this method work with cold brew?

This method is designed for hot coffee brewing. Cold brew requires a much longer steeping time (12-24 hours) and a different ratio, typically using coarser grounds.

Is this method good for travel?

Absolutely. It’s incredibly portable. All you need is coffee, a filter (or infuser), hot water, and a mug. It’s a lifesaver when you’re on the road or camping.

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

• Specific coffee bean recommendations for this brewing method.
• Detailed guides on espresso or cold brew preparation.
• Advanced techniques like pour-over or siphon brewing.
• Reviews of specific coffee makers or accessories.
• The science of coffee roasting and its impact on flavor.