[Centurion2000]

It is my understanding that in heat like this, WATER ALONE is not enough; you must have something like Gatorade, etc., with that stuff in in -- what, I cannot remember now).

You need water, salt and some bananas. Sodium and potassium (electrolyte) depletion in your body will give you some killer headaches and cramps.

[MamaB]

It can also cause fake heart attack symptoms. I had severe chest pains several years ago and went to the hospital. The tests showed that my K was very low so they gave me some of that and that fixed the problem for me.