Iced Coffee Concentrate - 2/3 cup ground coffee to 1 qt. of water. For iced coffee: mix half concentrate, half milk and pour over ice. If you want to get super fabulous, shake your milk and concentrate in a cocktail shaker with ice, which makes a nice little foam on top. I do this, and add a spoonful of sweetened condensed milk, too; this makes it a little sweeter and a little thicker.