Recipe for oral rehydration salts (from my wilderness first aid book):

To 1 liter water, add:
Potassium chloride (KCl) 2.5 g
Baking Soda 2.5 g
Salt (NaCl) 3.5 g
Glucose 20.0 g

Obviously, some kind of flavoring needs to be added to make this mixture palatable! But it gives you an idea of what you should look for in a hydrating drink mix.

Hydralite (formerly Gookinaid) is my favorite powdered drink mix because it isn't too sweet. I add half the suggested amount to my drinking water for the day.

I always used to have a problem with "in one end, out the other" with water. With Hydralite, "out the other" is less of a problem. The mix has a mild citrusy tang which I find refreshing.

I can't stand Gatorade! My grandkids drank a bottle of it on a recent trip, and I decided to save the bottle, since it has a wider mouth than soda bottles. However, no matter how many times I wash it, the bottle still smells of nauseating artificlal grape. It just went into the recycling!