When you are working outside, make sure you drink lots of fluids. Water is the best thirst quencher along with Gatorade. Try to avoid drinking a lot of sodas or other highly sweetened beverages because the sugar may coat your throat and make you thirstier. Another idea for those determined to work in the heat of the day is to apply water to your head and body, allowing it to evaporate. Not only can the cool water help to regulate your body temperature, but water will continue to cool you when it evaporates.
Water requires energy to convert from a liquid to a gaseous state.
The required energy comes from heat. Essentially, heat is removed as the water evaporates. That is the same cooling concept used in evaporative cooling systems to reduce greenhouse temperatures. Sweating is the body's natural way of providing water to evaporate and cool itself. Wear cool, comfortable clothing when working outside.