I often wonder what us "modern folks" are doing to ourselves with a thing we never needed before. The biggest money grab ever "Bottled water!" that we all over time got conditioned that we can not live without!? How much plastic are we ingesting thru that one?
I can chime in here...
When I was a kid I would spend extended amount of time at my grandma and cousins' place in a different city. The tap water there I used to call "slippery water". The specific think about it was that it had no taste, and I could drink gallons of it and still be thirsty. I absolutely hated it.
Then one day my cousin visited us and at some point mentioned "
Funny water you have here, it has no taste, and I keep drinking and I'm still thirsty". Then it hit me that for him our tap water was like their tap water to me.
Years later someone told me it's about the PH or something. The PH you get used to as a kid is the one you like. Not valid for all people, but for many.
The tap water I'm used to from young age tastes sweet. It doesn't help that just in my neighborhood there were three different mineral springs, with two of them set with publicly accessible fountains where you could go fill a bottle or something bigger. And our tap water was piped directly from the mountain, and had a taste different from what the other neighborhoods were getting.
In the US, the bottled water that most matches it is the Kirkland one from Costco. It tastes close to what I grew up with. If that one is not available, I can make do with Poland Springs, but barely. Everything else tastes like cooking oil to me.
From the "fancy" ones - the Evian is my nightmare. I can't drink that thing unless I'm dying from thirst.
So it's really mostly about taste, as far as I'm concerned.