If you're conscientious about drinking an adequate amount of water, make sure that you're not undermining your efforts with caffeine-containing beverages such as some coffee, tea and colas.

If you drink caffeine - which dehydrates the body - you are negating the health benefits of consuming water. Here's an imprecise rule-of-thumb for keeping your body hydrated: for every caffeinated or alcoholic drink you have, "replace" it with an additional glass of water.