Well RO water has varying degrees of other minerals as evidenced by varying conductivity measurements. But....that very pure water is somewhat corrosive as water is considered a universal solvent. You have heard that nature abhors a vacuum, similarly water abhors purity and seeks to dissolve what it can. I think I must get all the minerals I need because I drink RO water on the boat and at home, but I do eat a lot of food. Some drinking water companies, I would propose, add minerals for flavor rather than health. If I buy water at the store it is drinking water not distilled. I found this on the internet:
The additives being put into water are those naturally found in water and the quantities of these additives are likely too small to be of much significance. “If you had pure water by itself, it doesn’t have any taste,” says Bob Mahler, Soil Science and Water Quality professor at the University of Idaho. “So companies that sell bottled water will put in calcium, magnesium or maybe a little bit of salt.”