Water is a basic requirement for human function. But just fulfilling that requirement is not enough, to excel in your goals you need to drink more than just the bare minimum. Now, don't go drinking just any water, make sure that you can purify it and make it safe. Be sure that you always have access to water, bring extra purification, and know where to find water to purify. Also take note of yourself, learn to recognize when you need more water, and avoid that situation next time.