Two thirds of the Earth's surface is covered by water; it composes about the same amount of the human body. Depending on your size, your body can consist of anywhere from 55-78% water (and the brain is 90%!). It's safe to say that water is a vital nutrient to a healthy and productive body.
Just because you aren't feeling particularly parched does not mean that you are fully hydrated. In fact, thirst doesn't actually occur until AFTER you are already slightly dehydrated. Failing to consume enough liquids throughout the day can lead to dry mouth, nausea, lightheadedness, muscle cramps, and even food cravings. Warmer temperatures and exercise quickly dry out the body, so be sure that every time you sweat you also replenish your water supply. But before you reach for a 6-pack (soda or otherwise), know that alcohol and excessive caffeine can actually increase dehydration. Your best bet is to drink plenty of water throughout your day. Benefits of water include better skin, weight loss, mood boost, fatigue fighting, increased productivity, and many others. When it comes to water, drink up!