When it's hot, drink more water. Otherwise, here's another solution: eat fruit that's in season and the more water in the fruit the better! The hotter it gets the more I crave sweeter more watery fruits anyway. I want the ones that dribble down your chin with yummy sticky juices like peaches, watermelon, honeydews, or mangos... mmm.
Here's what I came up with when the heat was just too much to bear, and it hit the spot perfectly:
a few very generous chunk of watermelon
4 or 5 ice cubes
optional ingredients (not necessarily all at the same time):
1/2 to 1 C of canteloupe
1 tsp grated ginger
1. Blend everything in a good strong blender (aka. Vitamix).
If not thick and icy enough, add ice.
2. Pour and top with a sprig of mint!