1 cup fresh-ground coffee beans ( 4 cups water Add to a large pitcher. Stir. Cover & leave at room temperature overnight Strain through a coffee filter or a fine-mesh sieve lined with cheesecloth. I use a funnel and coffee filter and strain the coffee right into the glass bottle I store it in. To serve, mix one part coffee mixture (it’s quite concentrated) with one part water in a tall glass. Cold-brewed iced coffee concentrate keeps in the refrigerator for up to a week.