I had this punch at a bridal shower recently. It is seriously to die for and perfect for a hot summer day. They serve a drink similar to this one at Red Robin and they put raspberry syrup and blueberries in it. Loooove at first sight...I'm a believer!
5 1/2 qt. water (22 cups)
1 c. frozen limeade concentrate
3 cups of sugar
1 large bottle Sprite/7up/Sierra Mist
Mix water, until the limeade and sugar are completely dissolved. Pour drink mix into gallon size freezer Ziploc bags (each about 2/3 way full, sealed tightly) and freeze until completely frozen (over night). When ready to serve punch, smash bags on hard surface to loosen up frozen drink mix and pour into punch bowl. Pour bottle of soda over it and mix until nice and slushy.