Tap water quality

[cam00]

I agree with you Mr Bill. And, the situation is slated to get worse over time, if the scientists who have investigated fresh-water supplies worldwide are correct.
One of the very best activated carbon filters with a stainless steel tank is made by a USA company called Multipure. By adding a reverse osmosis membrane to that system, it will take out virtually ALL chemical contaminants, ALL heavy metals, ALL bacteria including cryptosporidium, and probably all virus and other pathogens like dengue and giardia. These systems will last at least 1 year to a year and a half without changing filters. With a system in your house at point-of-use, you can be absolutely assured of true purified water.

I very much doubt that there are any laws in MEXICO regulating bottled water sold publically, and, as in the USA, many times bottled water has been found to be no better than ordinary tap water, with various chemical, metal and other pollutants that were tested to be found in water labeled as TOTALLY PURE. Even if there are laws regulating bottled water, it's even more unlikely that those laws are ever enforced.