Don't underestimate the power of nutrition. Complex carbs and protein before the round will help regulate your blood sugar levels,
which will keep you even-keeled and prevent energy spikes during your round. During the round, light snacks such as nuts, fruit and turkey jerky will keep you alert and reduce fatigue. Be sure to avoid simple carbs and products with any added sugar. As for hydration, stick with water.
Try to consume 16-ounces of water per hour, including plenty before the round on hot days. Avoid sports drinks, fruit juices and soda, or else your scores will trend in the same direction as your blood sugar.
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