To prevent dehydration while cycling, hydrate adequately before, during, and after your ride. Drink water or electrolyte-rich fluids regularly, especially in hot or humid conditions. Aim to consume about 16-20 ounces of fluid per hour of cycling, adjusting based on intensity and duration. Use a hydration pack or water bottles mounted on your bike for easy access. Pay attention to signs of dehydration such as thirst, dry mouth, fatigue, or dark urine, and take breaks as needed to rehydrate and rest. Proper hydration supports performance, recovery, and overall well-being.