1 can frozen pina colada concentrate, thawed
1 can frozen orange pineapple juice concentrate, thawed
4 liters of diet lemon-lime soda (That's two 2-Liters for the mathematically challenged)
1 bag pebble ice (you can get this at most gas stations or grocery stores)
1 bag frozen raspberries
Pour the thawed concentrates into your punchbowl and stir. Use one of the empty cans and fill it with water four times and add it to the mixture. Stir. Add your diet soda to the mixture. (You can use regular sugar-filled soda, it just makes it sweeter). Next, add about half your bag of pebble ice. Lastly, add your frozen raspberries to the top. Viola!