Lemon-lime soda gives this icy raspberry drink a bubbly finish.
In a blender combine half the water, one can lemonade concentrate, and one package frozen raspberries in syrup; add half the ice. Cover and blend until smooth and slushy, stopping to scrape down sides as necessary. Transfer mixture to a 6-quart* freezer container. Repeat with remaining water, lemonade concentrate, raspberries, and ice. Cover and freeze about 4 hours or until firm.
To serve, scoop lemonade mixture into glasses. Slowly pour carbonated beverage into lemonade mixture; stir gently.
If you don't have a 6-quart freezer container, use two smaller containers.
If desired, add a splash of raspberry-flavor liqueur or raspberry-flavor vodka to individual servings of slush.