Tangy Punch

2 6-oz cans frozen limeade
2 6-oz cans lemonade
2 19-oz cans unsweetened grapefruit juice
2 19-oz cans pineapple juice
3 1-qt bottles ginger ale
1 qt water
3 qt chopped ice

Blend undiluted limeade and lemonade, grapefruit and pineapple juices. Just before serving, stir in ginger ale, the quart of water and ice. Makes about 50 punch-cup servings.