How to Use a Cold Brew System: Step-by-Step Guide to Smooth, Low-Acid Coffee

Quick Answer

Use a cold brew system by combining coarsely ground coffee with cold water at a 1:4 to 1:8 ratio, steeping for 12–24 hours, then filtering through the system's filter and felt. The Toddy Cold Brew System makes this easy with its nonelectrical design, producing a smooth, rich concentrate you can dilute to taste.

Cold brew is a favorite for coffee lovers who want a smooth, low-acid cup without the bitterness of hot brewing. A dedicated cold brew system simplifies the process—no fancy equipment, no heat, just time and the right ratio. This guide walks you through the steps from start to finish.

Whether you're a first-time cold brewer or looking to refine your routine, the principles are the same. We'll cover the key ratios, steeping times, and filtering steps, plus common mistakes to avoid. Along the way, we'll highlight the Toddy Cold Brew System, a nonelectrical option that produces a smooth, rich concentrate right in your kitchen.

What You Need: Cold Brew System, Coffee, and Water

Before you start, gather your equipment. A cold brew system like the Toddy includes a brewing container, a reusable filter, and a decanter. You'll also need coarsely ground coffee and cold, filtered water. The grind size matters—too fine and your brew will be cloudy and bitter; too coarse and it'll be weak.

The Toddy Cold Brew System is a nonelectrical coffee maker that produces a smooth, rich liquid concentrate. It's designed for simplicity: you add coffee and water, steep, then drain. Because it's nonelectrical, you can use it anywhere—no outlet required.

• Use a coarse grind, similar to breadcrumbs, to avoid over-extraction.
• Cold, filtered water gives the cleanest flavor.
• The Toddy system includes a reusable filter and felt that you rinse between batches.

The Golden Ratio: How Much Coffee and Water?

The standard cold brew ratio is 1 part coffee to 4 parts water for a strong concentrate. Some prefer a milder 1:8 ratio if you plan to drink it straight. For the Toddy, the recommended ratio is about 12 ounces of coffee to 56 ounces of water, which yields a concentrate you can dilute.

Remember: cold brew concentrate is meant to be diluted. A common mistake is drinking it undiluted, which can be overly strong and bitter. Start with a 1:1 or 2:1 ratio of water to concentrate when serving.

• Start with 1:4 coffee-to-water for a balanced concentrate.
• If you prefer a lighter brew, use 1:6 and skip dilution.
• Always stir the grounds and water together to ensure even saturation.

Steeping Time and Temperature

Cold brew steeps for 12 to 24 hours at room temperature or in the fridge. The longer you steep, the stronger and more caffeinated the result. For a balanced, low-acid brew, 18 hours is a good middle ground. Use the Toddy's lid to keep out dust and maintain a consistent temperature.

After steeping, drain the concentrate through the system's filter. The felt filter catches the fine grounds, leaving you with a clean, smooth liquid. If your brew tastes bitter, it may have steeped too long—next time, shorten the time or use a coarser grind.

• Aim for 18 hours as a starting point.
• Taste-test at 12 hours to see if it's strong enough.
• If it's bitter, reduce steeping time or use a coarser grind.

Filtering and Storing Your Concentrate

Once your steep time is up, place the Toddy's decanter underneath and lift the plug to drain. Let the concentrate flow through the filter slowly—don't rush it by pushing the grounds down. After draining, you can pour the concentrate into a glass jar or bottle and store it in the fridge.

Cold brew concentrate stays fresh for up to two weeks when refrigerated. Because it's a concentrate, a little goes a long way. You can make a week's worth of coffee in one batch, which is perfect for meal prep or busy mornings.

• Store concentrate in an airtight container in the fridge.
• Label with the date you made it—it keeps for about 2 weeks.
• Shake gently before using, as sediment may settle.

Step-by-Step Cold Brew System Instructions

1. Step 1: Coarsely grind your coffee: Grind enough coffee for your batch to a coarse consistency, like sea salt. A burr grinder gives the most even grind, but a blade grinder works if you pulse in short bursts. Checkpoint: Avoid fine grounds—they'll make your cold brew cloudy and bitter.
2. Step 2: Add coffee and water to the brew container: Put the grounds in the Toddy's brewing container, then slowly pour cold water over them. Stir gently with a long spoon to ensure all grounds are saturated. Use a 1:4 ratio for a standard concentrate. Mistake to avoid: Don't skip stirring—dry grounds will extract unevenly, giving a weak or sour brew.
3. Step 3: Seal and steep for 12–24 hours: Place the lid on the Toddy container and let it steep at room temperature or in the fridge. Start with 18 hours for a balanced flavor profile. Checkpoint: Taste a small amount after 12 hours. If it's strong enough, you can drain it early; if not, continue steeping.
4. Step 4: Drain and filter the concentrate: Put the felt filter in the decanter and place the decanter under the brew container. Lift the plug to let the concentrate drain. Let it flow slowly—this takes time but yields a clean cup. Mistake to avoid: Don't press or squeeze the grounds—that forces bitter compounds into your brew.
5. Step 5: Store and serve: Pour the concentrate into a glass jar or bottle and refrigerate. When serving, dilute with water or milk to taste—try a 1:1 or 2:1 water-to-concentrate ratio. Add ice and sweetener if desired. Checkpoint: Your concentrate will keep in the fridge for up to two weeks. Label the jar with the date.

Products to Help You Brew Better Cold Brew

• Toddy Cold Brew System: The Toddy Cold Brew System is a nonelectrical coffee maker that produces a smooth, rich liquid concentrate to make the best cold brew right from your kitchen. This system simplifies the cold brew process with a dedicated container, filter, and decanter—no need to improvise with separate equipment. Its nonelectrical design means you can brew anywhere, and the felt filter ensures a clean, sediment-free concentrate.

With a cold brew system like the Toddy, making smooth, low-acid concentrate at home is simple and repeatable. Master the ratio and steeping time, avoid the common pitfalls, and you'll have a week's worth of coffee ready in minutes of active time. Try it with your favorite Death Wish beans for a bold, smooth cup.