Combine the coffee grounds and water in a large container.
Stir well and cover.
Let sit for 12-24 hours (or minimum of 2 hours if you need your caffeine fix sooner). Allow it to sit at room temperature for best results but you can also store in the refrigerator.
After sufficient seeping time is done, line a fine mesh sieve with a coffee filter and sit it on top of large, clean container. Cheesecloth can also be used to strain the liquid but you may need several layers.
Strain the cold brew, replacing the filter as needed until all of the cold brew has been strained.
Store in a container with a lid in the refrigerator for up to one week.