Hydration isn’t just important during physical activity. Sitting in the sun on a hot or humid day can cause dehydration. Being thirsty isn’t the best indicator of your need to hydrate, as it means you are already dehydrated. A good rule of thumb to tell if you are properly hydrated is to pay attention to the color of your urine. Pale and clear urine means you’re well hydrated. Dark urine means drink more fluids. Drinking water is the best way to stay hydrated. Also, certain foods include a high percentage of water, such as fruits and vegetables.