At the airport gate, on my way back to the U.S. (from Africa), the second security check confiscated the 3 liters of water I had just purchased in the main terminal. I cried. Literally, I cried. Clearly, the security agent didn’t understand exactly how much water I consume on a 17 hour flight (about 6 liters actually!). Water has always been my drink of choice. It just makes me feel good. I tell my clients to drink water if they have a craving, a headache, are constipated, hungry, etc. Water is so beneficial, so easy, so free yet so easily overlooked. It’s really a no brainer (actually your brain is 90% water!!!). Your body is about 70% water, the majority of your blood and every cell in your body is composed of water. Therefore, you need water to function properly.
I don’t get headaches and don’t own Tylenol, Advil, etc. I believe it’s because I drink enough water. I’ve often been complimented on my clear, youthful skin. Again, I thank my water intake!
As with most things, the amount of water for each person is very individual, but if your pee isn’t mostly clear or you have any of the symptoms I mentioned above, you most likely aren’t getting enough
H2O. Some suggest 8 (8 oz) glasses a day while others suggest take
your body weight (in pounds), divide it in half and drink that many
ounces. Listen to what your body needs.
If you don’t care much for the taste of... nothing, then you can add a squirt of lemon, a squeeze of lime, a few sprigs of fresh mint or a cucumber or orange slice. You can even be so bold as to add a few berries or watermelon. What ever gets you to drink it up. Cheers to your good health!
Top 10 Benefits of Drinking Water: Don't Medicate, Hydrate!
1. Increases Energy & Relieves Fatigue – Since your brain is mostly water, drinking it helps you think, focus and concentrate better and be more alert. As an added bonus, your energy levels are also boosted!
2. Promotes Weight Loss – Removes by-products of fat, reduces eating intake (by filling up your tummy if consumed prior to meals), reduces hunger (hello natural appetite suppressant!), raises your metabolism and has zero calories!
3. Flushes Out Toxins – Gets rid of waste through sweat and urination which reduces the risk of kidney stones and UTI’s (urinary tract infections).
4. Improves Skin Complexion – Moisturizes your skin, keeps it fresh, soft, glowing and smooth. Gets rid of wrinkles. It’s the best anti-aging treatment around!
5. Maintains Regularity – Aids in digestion as water is essential to digest your food and prevents constipation.
6. Boosts Immune System – A water guzzler is less likely to get sick. And who wouldn’t rather feel healthy the majority of the time? Drinking plenty of water helps fight against flu, cancer and other ailments like heart attacks.
7. Natural Headache Remedy – Helps relieve and prevent headaches (migraines & back pains too!) which are commonly caused by dehydration.
8. Prevents Cramps & Sprains - Proper hydration helps keep joints lubricated and muscles more elastic so joint pain is less likely.
9. Puts You in a Good Mood – When the body is functioning at its best, you will feel great and be happy!
10. Save Money! - Water is FREE! Even if you choose bottled/filtered water, it’s STILL cheaper than that high sugar and fat-filled latte!
source: www.mindbodygreen.com/0-4287/10-Reasons-Why-You-Should-Drink-More-Water.html

I would like to add drinking water early in the morning without brushing your teeth first is also good for u as enzymes accumulated on your tongue improves your immune system along with other health benefits.