Your body will lose water as you play, so drink 16 to 32 oz. Special sports drinks are not necessary. Wear cotton clothing. These suits cause you to lose more water than is healthy, and you may burn fewer calories. Warm up by doing some stretches for you thigh and calf muscles, then do some light calisthenics and jogging in place.
Most clubs require players to wear eye protection.
You should not depend on your regular prescription glasses, because they are not designed to give enough protection. Also, open eye guards don't protect you eyes well enough. Don't ignore cramps, pain or fatigue. Most major injuries result when a player keeps playing after an injury. Always allow at least 18 inches between you and your opponent during play.