[throwaway76543]

Tap water doesn't necessarily have any more or less mineral content than bottled mineral water. The variation between mineral water brands and the variation between tap water sources (mostly: well water vs surface) is much larger than any difference between bottled and tap.

If you live in an area with hard tap water you're essentially drinking "mineral water" out of the tap.

Here's some data for ya:

Mineral Content of Tap Water in Major North American Cities: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1495189/table/t...

Mineral Content of Selected Commercially Available North American Bottled Waters: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1495189/table/t...