I did a lot of research as to how to do that. Of course there are things you can buy to facilitate doing this, and I have tried a couple of them. They work great, but like anything else over time they need maintenance. I got to the point where I needed to buy replacement parts for one of my units, and I decided there had to be an easy way to do this using stuff I basically already had around the house or could easily get locally...after all you are just soaking coffee in water, right?
The main thing is I wanted it to be easy, fast, and be able to do large batches since my wife and I drink plenty of coffee. Also, since cold brewing is a little less efficient, you can make it more cost effective by brewing the same grounds twice (the first batch gives you an espresso strength syrup, and the second batch is regular strength coffee), so I wanted to be able to do that as well. To follow my process you will need:
A 2-quart Mason jar
A small strainer
A restaurant style pitcher...needs to have a lip around the pour spout
Something to put the final product in...I use a juice carafe
Paper towels
Scissors
And of course coffee!
A note about coffee choice...we have found that the end product is so much smoother and more delicious that we can buy a less expensive coffee and get the same results as when we were brewing premium coffee the traditional way. Another thing to consider to help keep your cold-brewing costs down.
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Signing UpStep 1: Modify your strainer
You can then use the insert from the lid of the jar as a template and cut the screen to the same size. You will be using the screen as a replacement insert to pour out your coffee. After you cut it out, make sure it fits on top of the jar and that you can screw the ring on over it.









































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The comment below you are referring to has nothing to do with the process I outlined in the Instructable, I was explaining an alternate way which was how I actually experimented with the process to see if it was even worth pursuing. I used coffee bags and water in a 1-quart measuring cup.
Also, a quick way to give it a try without investing too much time or trouble is to use the single cup coffee bags...the ones that look like tea bags...that's actually how I got started since that is what we had on hand when I decided I wanted to try it. I can't remember the proportion I used, but I think it was like 8 or 10 bags in 32 oz of water. Come to think of it, I wonder if you could brew a regular cup of coffee with just one bag if you let it sit overnight...
Thanks for this, it just felt so un-American, drinking tea all the time!
My husband went on a two-day business trip and couldn't wait to get back to his cold-brew...he said every cup of coffee gave him terrible heartburn...