How to Make Cold Brew Coffee at Home: Step-by-Step Guide

What You Need

Making cold brew coffee at home requires just four things: coarse-ground coffee, cold or room-temperature water, a container with a filter, and 16-18 hours of patience. No special skills, no expensive equipment, no boiling water. It is one of the simplest coffee methods that exists.

Equipment:

• A cold brew pitcher, mason jar, or French press
• A fine mesh filter, cheesecloth, or built-in filter (if using a cold brew maker)

Ingredients:

• 100 grams coarse-ground coffee (for every 500 ml of water)
• 500 ml cold or room-temperature filtered water

That is it. No sugar, no milk — those go in when you serve it, not when you brew it.

Best coffee beans for cold brew: Medium to dark roast works best. Light roasts lose their delicate flavour notes in cold water. Indian beans from Coorg or Chikmagalur — like Cothas Gold, Blue Tokai's Attikan Estate, or Araku Valley coffee — all make excellent cold brew. Whatever you choose, make sure it is ground coarse.

Step-by-Step: Making Cold Brew

Here is the complete process for making cold brew coffee at home using a cold brew pitcher. The same steps work with a mason jar or French press — the only difference is how you filter at the end.

1. Grind your coffee coarse — the pieces should look like rough sea salt or breadcrumbs. If buying pre-ground, ask for "French press" or "cold brew" grind at the shop.
2. Add coffee to the filter — if using a cold brew maker with a built-in filter, drop the grounds directly into the filter basket. If using a jar, just add them loose (you will strain later).
3. Add cold water — pour cold or room-temperature filtered water over the grounds. Use a 1:5 ratio for concentrate (100g coffee to 500ml water) or 1:8 for ready-to-drink (100g coffee to 800ml water).
4. Stir gently — give it one slow stir to make sure all the grounds are wet. Dry pockets of coffee will not extract properly.
5. Seal and refrigerate — put the lid on and place the pitcher in the fridge. If your kitchen is above 25°C (most Indian kitchens in summer), always use the fridge. Room temperature works in winter but speeds up extraction, so reduce time to 12 hours.
6. Wait 16-18 hours — this is the hardest step. Do not open it, stir it, or check on it. Just let it sit.
7. Remove the filter — lift the filter basket out of the pitcher and discard the grounds. If using a jar, strain through a fine mesh sieve or cheesecloth into another container. Important: remove the filter before pouring any cups.
8. Serve and enjoy — if you made concentrate (1:5), dilute with equal parts water, milk, or ice. If you made ready-to-drink (1:8), pour and drink as-is.

Total hands-on time: about 5 minutes. Total waiting time: 16-18 hours. Total effort: almost zero.

Getting the Grind Size Right

The correct grind size for cold brew coffee is coarse — about the texture of rough sea salt or raw sugar. This is the single most important variable in making good cold brew. Get this wrong and your coffee will either be bitter (too fine) or weak (too coarse).

If you do not own a grinder, most local coffee shops will grind beans for you. Just ask for a "French press grind" or "cold brew grind" — they will know what you mean. A burr grinder (Rs 1,500-3,000) is a worthwhile investment if you make cold brew regularly, as it produces much more uniform pieces than a blade grinder.

How to Serve Cold Brew

How you serve cold brew depends on whether you made concentrate or ready-to-drink brew.

If you made concentrate (1:5 ratio):

• Classic: Mix 1 part concentrate + 1 part cold water. Add ice.
• Creamy: Mix 1 part concentrate + 1 part cold milk (dairy or oat).
• Sweet: Add jaggery syrup, honey, or condensed milk to taste.
• Hot: Mix 1 part concentrate + 1 part hot water. Yes, you can drink cold brew hot.

If you made ready-to-drink (1:8 ratio):

• Pour over ice and drink as-is
• Add a splash of milk if you like

How to Store Cold Brew

Cold brew concentrate lasts 7-10 days in the fridge when stored in an airtight container. Once you dilute it with water or milk, drink it within 2-3 days. The InstaCuppa Cold Brew Maker has a twist-lock airtight lid that keeps it fresh and prevents fridge odours from getting in.

Never leave cold brew at room temperature for more than 2 hours after it is done brewing. In Indian summers (30°C+), bacteria can grow quickly in coffee sitting on the counter. Always store in the fridge.

5 Common Beginner Mistakes

1. Using fine-ground coffee — this causes bitter, over-extracted cold brew. Always use coarse grind.
2. Not using enough coffee — cold brew needs 3x more coffee than hot brew. Use a 1:5 ratio for concentrate.
3. Steeping for 24+ hours — 16-18 hours is the sweet spot. Longer just adds bitterness.
4. Drinking concentrate without diluting — if you used a 1:5 ratio, that is concentrate. Dilute 1:1 before drinking.
5. Pouring with the filter still in — remove the filter from the pitcher first, then pour. Otherwise fine grounds can slip into your cup.

For more troubleshooting, read our detailed guide: Cold Brew Coffee Maker Problems: Bitter, Weak & Watery — How to Fix.

Saran Reddy

Founder, InstaCuppa | Building kitchen tools that give busy Indian moms their time back