Drink electrolytes (like gatorade) in addition to plenty of water. Do not substitute Gatorade for water. Your body needs electrolytes but only in moderation. Shade will do more for water conservation than you realize. If you stop sweating and you are still hot, stop what you are doing immediately and go drink more water. If you are doing everything right, your piss should be clear or very light in color. If you have dark piss, go drink more water.