One hydration recommendation for exercise is to drink about 20 fluid ounces about 2-3 hours before exercise.

Hydration Recommendation

Guidelines suggesting the amount of fluid intake to maintain optimum health and physical performance, often based on factors such as body weight, environment, and activity level.

Fluid Ounces

A unit of volume used primarily in the United States to measure liquids, approximately equal to 29.57 milliliters.