Grape Juice Crush
["1 (24 oz.) bottle grape juice, chilled", "1 c. orange juice, chilled", "1/4 c. lemon juice, chilled", "1 qt. ginger ale, chilled", "1/2 c. sugar (optional)"]
["Mix juices and sugar, stirring until sugar is dissolved.", "Just before serving, stir in ginger ale.", "Serve over ice."]
["grape juice", "orange juice", "lemon juice", "ginger ale", "sugar"]