Directions:
Rinse seedless grapes with water, pluck from stems, and place in individual serving-sized containers. Freeze solid!

Other suggestions and comments:
A mixture of red and green grapes is pretty! These are refreshing, and the icier, the better! It takes time to melt them/chew them in the mouth. Some kids will drink less water than usual on field trips, because they have a fear of needing a bathroom mid-transit on the bus. Dehydration is not a healthy thing...

I once took frozen grapes along while driving through the desert at night/early a.m. in summer, no air conditioning. Rest Stop safety paranoia, I guess. Made the trip in comfort.

Frozen grapes can also be one of those li'l diet tricks easing the way to swimsuit season.