Coarsely grind coffee beans
Add 1 cup ground coffee to a jar or pitcher
Add 4 cups cold or room-temperature water
Stir until all grounds are fully saturated
Cover the container
Steep at room temperature or in the refrigerator for 12–24 hours
Strain through a coffee filter, cheesecloth, or fine mesh strainer
Transfer the cold brew concentrate to a clean bottle or jar
Dilute with water or milk to taste
Serve over ice
Store in the refrigerator for up to 1 week