Mineral water like Topo Chico comes from a known natural source. Different brands are typically based around a geographical location due to the natural spring where the water is sourced. Different locations offer different mineral profiles. Some newly marketed products that do not come in a glass container are not worth the risk in my opinion, but those versions are still better than regular filtered water. Brands I would recommend are Perrier (France, but owned by Nestle since 1992) or Topo Chico (Mexico) are some of my favorites.
