Grind your coffee beans to a medium coarse consistency.
Add the water and ground coffee beans to a mason jar or other glass storage container. Then, leave it on your counter to steep for 12-15 hours.
Strain the coffee through a fine mesh sieve that's lined with a couple layers of cheesecloth over a large measuring cup or bowl. Alternatively, you could use a nut-milk bag or coffee filter on top of the sieve.
Pour the strained cold brew concentrate back into a clean mason jar and store in the refrigerator.
To serve, pour the cold brew concentrate over ice, with water or with your favorite milk or creamer.
The recipe make approximately 3 cups of cold brew concentrate.