I've tested bottled water extensively myself. Most cheap bottled waters have a pH of 4.5 to 5.5, Ozarka being the worst at a 4- which is VERY acidic. The body's pH is always 7.35 to 7.45 and tap water legally has to be buffered to about a 7. Drinking acidic water all day devoid of minerals can cause many different health problems which I will not go in to. I've also had patients drinking alkaline water ALL DAY which literally makes them pump out acid on their blood work to combat it. The body truly wants to be neutral! You also shouldn't drink alkaline water with meals as it washes out the stomach acid and decreases food break down and absorption of nutrients. The easiest thing to do is truly to filter your own tap water. You can buy bottled water that has the pH and mineral content on the back- which is expensive water like Evian, Fiji, Rocky Mountain spring water- and you also are dealing with the plastics. I have a Berkey water filter at home and the office and have been very happy with it.