Drink water like it's your job!
The more you drink, the better you will feel and perform.
Shoot for atleast 1 gallon a day. All those meatheads carrying around water jugs do it because it's the easiest way remind yourself how much more you have left for the day.
Lately I've been using shaker cups which I refill at water fountains but honestly, I do better with a fresh jug every morning with a few packets of amino acids added for flavor.