White Grape Cooler Punch

2 cans (12 ounces each) frozen apple juice concentrate, thawed
2 cans (11 1/2 ounces each) frozen white grape juice concentrate, thawed
6 cups cold water
12 cups (about 3 liters) chilled lemon-lime soda pop
Lemon and lime slices

1. In large container, mix juice concentrates. Stir in water.
2. Just before serving, pour into punch bowl. Add soda pop and lemon and lime slices. Pour over ice in glasses.