Orange Cranberry Spritzer

2 1/4 cups fresh orange juice

2 1/4 cups cranberry juice cocktail

1 1/2 cups fresh grapefruit juice

1 cup vodka (optional)

2 cups seltzer water or club soda, chilled

Shaved ice

In a large pitcher, combine orange juice, cranberry juice, grapefruit juice and vodka. Stir in seltzer water or club soda. Pour into large glasses filled with shaved ice.