That's interesting, I'll look into that! Sparkling water might be indeed a reason why people buy bottled water, although there are household solutions for that as well.

Well, above 'sparking water' was written, but 'mineral water' was meant. Sold in bottles and in restaurants and commonly purchased is indeed mineral water. What you can easily do at home is carbonize the water and make it sparkling, without, of course, the (real or imagined) health benefits and different taste of mineral water.