Popsicles .... even if you just pour water into a mold ... or
save a few plastic tubes and fill with water ... my kids just know
that they are COLD. And they love it.
Have a dedicated water bottle per kid ... keep filled with ice
water. I usually sprinkle a tiny bit of stevia in the water,
or a bit of flavored tea (they love peach and blueberry the best).
They drink more because of the flavor, and I'm happy because
it's not koolade and soda pop.
Freeze chunks of watermelon - drop into the water bottles
instead of ice cubes.
Watermelon ... serve after chilling in the frig.