Combine cold water and tea in a glass jar or plastic pitcher at a ratio of 1 tea bag per cup of water or 1 1/2 teaspoons of loose leaf tea per cup.
Place the container in the fridge. Wait 5 hours, more or less depending on your preference, then discard the tea bags or filter out the tea leaves. Or you could just leave them in for a stronger flavor.
Serve over ice with or without your favorite sweetener.