You don't have to use coffee concentrate by any means, by the way. You can simply brew black coffee and freeze in ice cubes trays, or go one step further and pre-cream (is that even a word?) them so that as the coffee melts, you also get more creamer to balance out the flavor.
Coffee Ice Cubes
- 2 cups brewed coffee or coffee concentrate/water combination
Freeze the coffee into ice cube trays, and then keep in a large freezer zip lock bag for future use.