1. Replacing water you lose throughout the day -
The body constantly loses water throughout the day, mostly through urine and sweat, but also from regular body functions like breathing. To prevent dehydration, you need to get plenty of water from drink and food every day.
2. Increasing brainpower and concentration -
Water is a part of our body's means of transporting essential nutrients to all the places that need them. Water aids our brain's function and concentration by giving it the electrical energy it needs to perform optimally.
3. Help Beat Tiredness -
Your fatigue can be a sign of dehydration. Whether you're working out or working a desk job, your body needs water to work well and keep cool. If you're thirsty, you're already dehydrated.
4. Aiding with Weightless -
Water is considered to be a natural appetite suppressant. It also increases calorie burning. Drinking enough water is essential for burning off fat from food and drink, as well as stored fat.
5. Flushing Toxins -
Water does help to keep your liver and kidneys in tip-top shape. The body relies on the liver to pick up toxins from the bloodstream and convert them into water-soluable substances that can be excreted in urine. The kidneys help out, too.
6. Improves Complexion -
Studies have revealed that drinking just two cups of water  can increase blood flow to the skin which gives it an even tone
7. Headache Prevention -
When the body is dehydrated, the brain can temporarily contract or shrink from fluid loss. This mechanism causes the brain to pull away from the skull, causing pain and resulting in a dehydration headache. Once rehydrated, the brain plumps up and returns to its normal state, relieving the headache.
8. Fresh Breath -
Drinking water will help keep odor under control because it helps wash away food particles and bacteria, the primary cause of bad breath.
9. Mood Booster -
Being dehydrated throws off the delicate dopamine and serotonin balances in the brain, natural chemicals that can increase/affect depression and anxiety. One of the fastest and easiest ways to improve your mood is by drinking a glass (or two!) of water.