Here are some tips in keeping your cool. Steer clear of carbonated drinks. Keep water at the net and take several swigs each time you switch sides. When it's humid outside, drink more since you since you sweat more. Your water should stay cool so keep it under a towel or in the shade on the court.
Sport drinks are good for longer periods of play, more than an hour.
They deliver carbohydrates, which keep your blood sugar up. So drink to keep your energy up, beat the heat, and stay healthy. Be a winner, drink plenty of water. No clinic or lesson can possibly spend enough time working on your serve . Make it a habit to serve a certain number each time .