Information On Water Intake

Everyone knows for your skin to retain its youthful appearance, it requires a minimum of 8 full glasses of water a day. It requires even more if you are exercising, or temperatures are high.

What you might not know, is that your water source is just as important.
Bottled water is a good source if it says "purified", or from a "natural spring source". What to avoid is any water that is bottled using tap water. If it is bottled with tap water it will say on the bottle or the cap, "from a municipal source", or "from a community water system". Keep away from that!
The best water sources available are from reverse osmosis systems, or carbon block filters.

Her is a segment of a story MSN did on water intake:

If you're drinking enough fluids, you're moving things more efficiently and quickly so toxins won't be sitting in your stomach for too long," says Bonci.
No need for eight cups?Although long accepted as conventional wisdom, the eight-cups-a-day recommendation is now being questioned by some health-care providers. "It's not clear to me that the advice is based on medical science," says Kirby. "That's just a number that may ensure adequate hydration."
Bonci suggests that body weight may be a better gauge. "Take a third of your weight in pounds and that's how many ounces you need to drink daily," she says. A 150-pound woman, for example, will need 50 ounces, which translates to a little more than six cups of water.
Activity level may increase requirements, too. "People who exercise will need more than the minimum," says Bonci, who also serves as director of sports nutrition at the University of Pittsburgh Medical Center. "They must drink two to three cups an hour before exercise, one to two bottles of water during, and at least three cups of fluid afterwards."