Drink wisely-Water is one of the best beverages for you. Your body depends on six to eight glasses of it a day to turn the food you eat into energy, and to wash out waste products that cause fatigue. Caffeine-containing drinks, on the other hand, actually can make you tired if they are overused. The result is sleep problems, restlessness and weariness. Keep servings to two or three a day.
Alcohol provides calories but little else.
It can slow reflexes, metabolism and your ability to focus. Both caffeine and alcohol also pull water from the body, which cuts into your energy. For every caffeine or alcoholic beverage you drink, follow it up with an extra glass of water. Some herbal mixtures promise peppiness. Most lack valid science to support these claims.