Yes, we know you are used to this from your home country. But there is a crucial difference.
The water you drink back home in most cases is “used” water. Most of it is not pumped up from way below ground but often kept in reservoirs where pollution and dirt has easy access. And in many places water is re-pumped into the water system after cleaning.
Apart from the fact that bottled water is the very same water we understand why many believe the bottled one is somehow more fresh or healthy.
But in Iceland the water you get when you turn on the faucet has never seen the light of day for centuries. It is pumped continually up from deep below the surface where lava caves have kept it crystal clear and given it a natural taste too.
This is also the case for most water bottling plants in Iceland but in those cases most often you´ll find some man-made additives. And why would you want to pay extra for natural water spoiled by man?