8 oz. unsweetened grape juice
8 oz. unsweetened apple juice
8 oz. unsweetened orange juice
1 qt. diet ginger ale (can replace ginger ale with Sprite, 7-Up, Club Soda, or just Sparkling Water)
Ice
Mix first 4 ingredients together in a pitcher.

Add ice cubes and 9 ounces of the beverage to each glass.
Serve immediately.