Findaspring.com -is a website that lists many springs and that has been done on the water. It's a great resource. If spring water isn't an option for you, I'd recommend investing in a quality water filter. Look for something that removes floride and toxins trom the water. Many water filters will have been tested and rated by laboratories like NSF. Look for those labels and third party testing that validates that the filter can do what it promises to do. There's no doubt that water is vital to countless biological and chemical processes that are happening in our bodies all the time. We have more molecules of water in our bodies than anything else. Water basically helps charge and power our cells. Our brains are bathed in cerebral spinal fluid which is over 99 percent water and this allows our premium computer (brain) to do the amazing things it can do. The amount of water you need depends on your size and other factors such as temperature and humidity. As a target for water intake, I generally recommend that a person drink one half their body weight in pounds-in ounces of water. So for a 150-pound person a ballpark figure would be 75 ounces of water per day. And I don't recommend getting water from your tap. Tap water contains toxins and drug residues and usually treated with chemicals. Some municipalities floridate water which is actually toxic to our cells. The mass-floridation of our water supply has been a health tragedy that our government still refuses to recognize. And the evidence that there are any significant dental benefits is shaky at best, believe me. I prefer glass containers to limit toxins from the container.    - Dr. Richard Gerhauser, M.D. - The Secrets of Underground medicine