Quality bottled water, tap water and some bottled water are not ph balanced.
Some examples of good bottled water are evian and panna although expensive.
There is a very popular cheap bottled water in Australia which is very low in mineral content, which is bad because that means a low PH especially when exposed to air.
After a couple of blood test results which showed metabolic acidosis, I got some ph sticks and checked my urine ph after drinking diffrent brands of bottled water, panna came out the best and the cheap bottled water was just shocking.