Rum Slush
["1 (8 oz.) lemonade (frozen)", "1 (8 oz.) orange juice (frozen)", "7 c. water", "2 c. sugar", "1 to 1 1/2 c. rum (1/2 pt., white)"]
["Heat water and sugar until sugar dissolves.", "Add lemonade, orange juice and rum.", "Stir until juices are dissolved.", "Freeze in 9 x 13-inch Tupperware container.", "Spoon in glass and add 7-Up."]
["orange juice", "water", "sugar", "rum"]