The ice cream in the baggies works great......I've done it with my daycare.
We also make blue jello and add gummie fishes in zip lock baggies for ocean day.
We have an ice cream sundae party too....I provide the ice cream and everyone invited bring 2 toppings to put on the sundaes. We just use styrofoam cups as dishes. After we have a huge water fight to cool off and clean up.
Here's to a great summer
debknechtel