Hydration is essential for ALL athletes of ALL sports. Even a 2% dehydration level can decrease performance. It is important that you consume fluids all day, not just around your workout or game.
2-3 hours before practice and games: 16-20oz fluid (approximately one bottle water or sports drink)
10 minutes before practice and games: 5-10oz fluid (water or sports drink)
Very individualized to athlete’s sweat rate, but a general rule is 5-10 oz water or sports drink every 15-20 minutes.
After one hour of exercise, make sure you are consuming some sports drink for carbohydrates.
If it is extremely hot and humid, rely more on a sports drink to ensure adequate carbohydrates and electrolytes (sodium, chloride, potassium). You may also need to drink a greater quantity.
Muscle cramps, tears, pulls, strains
Nausea
Dry mouth
Increased muscle soreness
Joint pain
Lightheadedness or headache
Increased time needed for recovery
Heat exhaustion/heat illness
Decreased performance
Heat stroke
Fatigue
Susceptibility to colds and sickness
URINE COLOR: Urine should be a "lemonade" color; if it looks like apple juice, it may be a sign of dehydration.
BODY WEIGHT: Weigh yourself pre- and post-exercise to determine how much fluid is needed to rehydrate your body adequately.
The information above is from https://www.nata.org/ready-play
More hydration information and resources are available on the Korey Stringer Institute's website https://ksi.uconn.edu/hydration/