How long does homemade cold brew concentrate last in the fridge?

Sealed in an airtight jar, cold brew concentrate stays fresh for up to two weeks. Diluted, ready-to-drink cold brew is best within 5–7 days because water speeds flavor degradation. Always store it cold and covered.

Can I make cold brew without a special maker?

Yes. A Mason jar and a nut milk bag or a French press both work well. Steep coarse grounds in cold water for 16–18 hours, then strain. The main trade-off is a slightly cloudier cup and messier filtering compared to a dedicated brewer.

Why is my cold brew weak or watery?

Usually the ratio or grind is off. For concentrate, use 1 part coffee to 5 parts water by weight and don't over-dilute. If you're using a coarse grind and correct ratio but it's still weak, extend the steep to 18–24 hours or grind slightly finer.

By the Cold Brew Coffee Gear Guides Editorial Team · 4 min read

Home cold brew coffee equipment: the complete beginner's guide

Cold brew isn't complicated, but the gear and ratios trip up almost every beginner. Steep too fine a grind and you get sludge; use the wrong ratio and you either waste beans or drink brown water. This guide covers exactly what equipment you need, how much to spend, and a repeatable recipe that produces smooth, low-acid concentrate every time.

What cold brew actually is (and why gear matters)

Cold brew steeps coarsely ground coffee in room-temperature or cold water for 12–24 hours. There's no heat, so extraction is slow and gentle, pulling out far less acid and bitterness than hot brewing. That's why cold brew tastes smooth and chocolatey even from beans that would be sharp when brewed hot.

Cold brew vs iced coffee ratio

These are not the same drink. Iced coffee is brewed hot at a normal ratio (around 1:16 coffee to water) then poured over ice. Cold brew is usually made as a concentrate at 1:4 to 1:8, then diluted before drinking.

Concentrate: 1:5 by weight (e.g., 200g coffee to 1000g water), diluted 1:1 with water or milk when serving.
Ready-to-drink cold brew: 1:8 (e.g., 125g coffee to 1000g water), no dilution needed.
Iced coffee: 1:16 hot brew, brewed slightly stronger to account for melting ice.

Making concentrate is more efficient: it stores better, takes up less fridge space, and lets you dial strength per cup.

The best cold brew coffee maker for beginners

You don't strictly need a dedicated maker, but the right one saves messy filtering. There are three practical tiers.

Budget: a mason jar and a nut milk bag

For under $10, steep coffee in a 1-quart Mason jar and strain through a fine mesh nut milk bag lined with a paper filter. It works, but it's fiddly and you lose grounds in the pour.

Best overall: immersion brewers with a mesh basket

The OXO Compact Cold Brew Maker (~$30) and the Toddy Cold Brew System (~$40) are the standards. The OXO is compact, fits a fridge shelf, and drains through a switch valve into a carafe. The Toddy uses a felt filter and makes larger batches (about 56 oz of concentrate). Both deliver clean, grit-free results.

Simple and elegant: the French press

If you already own a French press, use it. Add coarse grounds and cold water, steep 18 hours, then press slowly. A 1-liter press makes about four servings of concentrate. The only downside is a slightly cloudier cup than a felt-filtered brewer.

The best grinder for cold brew

Grind size is the single biggest quality variable. Cold brew needs a coarse, even grind, similar to raw sea salt. Fine grounds over-extract and pass through filters, making muddy, bitter concentrate.

Best value burr grinder: Baratza Encore (~$150) — consistent coarse grind, easy to clean.
Budget burr option: OXO Brew Conical Burr (~$100) — reliable for cold brew coarseness.
Hand grinder: Timemore Chestnut C2 (~$70) — great even grind if you brew small batches.
Avoid: blade grinders. They chop unevenly, producing dust that clouds your brew and fine chunks that over-extract.

If you buy pre-ground, ask for a French press or cold brew grind specifically. Standard drip grind is too fine.

Cold brew concentrate recipe

This makes about 1 liter of concentrate that yields roughly eight 8-oz drinks after dilution.

Coffee: 200g whole beans, coarsely ground (1:5 ratio)
Water: 1000g (1 liter) filtered, room temperature
Steep time: 16–18 hours

Steps

Grind 200g of beans coarse. A medium roast like a Brazilian or Colombian gives classic chocolate-nut notes.
Combine grounds and water, stirring gently to fully saturate. No dry clumps should remain.
Cover and steep at room temperature for 16–18 hours, or up to 24 hours in the fridge for a milder cup.
Strain through the brewer's mesh filter, then again through a paper filter for a cleaner finish.
Store concentrate in a sealed jar in the fridge for up to two weeks.
To serve, mix 1 part concentrate to 1 part water or milk over ice. Adjust to taste.

Longer steeps aren't always better. Past 24 hours, extraction stalls and woody, papery flavors creep in. Stick to 16–18 hours at room temp for the sweet spot.

Your beginner equipment checklist

Immersion brewer (OXO Compact or Toddy) — or a French press you already own
Burr grinder (Baratza Encore or Timemore hand grinder)
Kitchen scale that reads in grams — ratios by weight beat scoops every time
Paper filters for a second clarifying strain
Airtight glass storage jar (1 liter)
Fresh whole beans, medium to medium-dark roast

Total starter cost lands around $180–$220 if you buy a brewer and grinder together, or under $30 if you already own a grinder and use a Mason jar.

The takeaway

You need three things to make excellent cold brew at home: a coarse, even grind from a burr grinder; a brewer that filters cleanly; and a ratio you actually weigh. Start with a 1:5 concentrate, an 18-hour steep, and dilute 1:1. Once that's dialed in, experiment with ratios and beans. Everything else is preference.