OT, but parts of the brewing industry makes use of “Burton water”. The water in Burton on Trent is perceived as being excellent for the brewing of beer, so in other locations, groundwater or potable water is demineralised by reverse osmosis, and then has the “Burton” mineral mix added back.
I also installed a water processing plant on an industrial estate in Glasgow, where borehole water was brought up, filtered, demineralised, remineralised, carbonated, and sold as sparkling “mineral” water.