I recall a published report on the examination of water here in the
Seattle, Washington area where I live regarding the constitution of
bottled water. The Seattle Water utility purchased a couple of dozen
different brands of bottled water from area grocery stores and ran
lab tests to compare them to the water in the Seattle water system.
Nearly all were identical!
Draw your own conclusion, but mine is that much bottled water is
simply bottled tap water. Bottle water is not regulated by health departments.
The authors of the bread baking books in my collection seem to all
say that if your tap water tastes good, use it. If not, use bottled
water. I am lucky, my tap water is delicious.
Jerry Ulett