Place coffee grounds in the bottom of a 2-quart mason jar or pitcher. Pour cold water on top and use a spoon to stir to completely combine. Screw lid on top of jar or cover with plastic wrap and chill cold brew overnight or at least 12 hours.
Set a cheesecloth or coffee filter over a fine-mesh sieve and place sieve over an empty 1-quart mason jar or pitcher. Pour cold brew coffee through strainer, a little bit at a time until all the cold brew coffee is strained. Discard grounds.
Serve cold brew with creamer/milk, and ice or store in refrigerator up to a week. Enjoy!