It’s a problem and is one reason SFAS doesn’t run during the height of summer.
The best fluid to drink when you are sweating is water. I haven’t seen salt tablets used since the 80s; taking salt tablets may raise the body's sodium level to hazardous levels. Although there is some salt in perspiration, you don't really lose that much with your sweat, except in special (usually pathological) circumstances. As prevention is always the best method, have your guys eat their salt, sugar and cocoa packet with every meal and wash down with a quart of water (cocoa has potassium). Putting any kind of sport drink in the canteen or camelback is a bad idea. Things will grow in the sugar residue, especially in the jungle. Nalgene bottles work pretty well; have them flip a couple of spoonfuls in their mouths occasionally. Gatorade is the most reasonable price; make certain to cut it first. Remember, significant hyponatremia can result from voluntary overhydration and can be dangerous.
As for heat stroke, just remember that hyponatremia and significant dehydration are not always associated. Heat stroke usually results from total hypothalamic failure; the body can’t regulate, the temperature rises rapidly, the sweating system fails and the body cannot cool down. Cool them down, but go easy on the fluids with these casualties.
It’s a jungle out there.
