The key to good health is good water. To keep the tap water safe, water departments add chlorine. In most places, the tap water is safe. One need simply remove the chlorine to make it tasty. This page list web sites offering water filters online.
Berkey Filters (pueblocolor.com) - review Berkey Filters offers a gravity fed stainless steel water purifier. You can filter water from almost any source even when the power is out of if the municipal water supply has failed.
Katadyn Products (*) Katadyn offers a line of lightweight rugged lightweight filters and purifying systems that are popular among campers and NGOs engaged in disaster relief.
Dig Deep (www.digdeep.org) Dig Deep is an effort to help improve clean water access around the globe. The program has a compelling program called The 4 Liter Challenge which challenges you to live a day (or several days) on just four liters of water.