It’s literally just water, probably with some different bubbles than what is normal.

It reminds me of the “oxygenated” water trend, where there were oxygen bubbles that were added to normal water and it was marketed towards athletes or whatever. The extra oxygen per liter of the stuff was negligible, like 1/20th of the oxygen that would be inhaled in a single breath, so it fell out of favor very quickly since better breathing techniques would be infinitely more useful.