Place coffee grounds in the bottom of a large pitcher or jar. Pour cold water over grounds and gently stir to saturate. Cover pitcher with cheesecloth and let sit at room temperature for 12 hours.
Line a fine mesh sieve with cheesecloth and place over a second large pitcher or jar. Pour coffee through sieve into second pitcher, do not stir. Discard cheesecloth and grounds once all liquid has filtered through.
Rinse first pitcher and top with fine mesh sieve lined with a large coffee filter. Pour coffee through sieve slowly and allow to drip, do not stir. (This may take up to half an hour.)
Cover and refrigerate concentrate for up to two weeks.
Recipe by Bake Love Give at https://bakelovegive.com/cold-brew-iced-coffee/