I just had to horse laugh again, seeing somebody directly contrast "hard water" (less desirable) and "mineral water" (more so), in a particular context.
Please just say "bottled water"--at the very broadest!--if what you really mean to convey is commercially available water from particular sources of consistent qualities. And preferably specifying a bit more about what qualities you are looking for.
I grew up in an area previously chock full of mineral spring spas and resorts, where people would travel and pay pretty big bucks to take the waters. Precisely because it is so freaking packed with various combinations of minerals!
All the delicious mineral water you care to bottle up and haul--and we regularly did at home!--is readily available on tap, for free. In the form of mountain springs gushing straight out of the rocks, sometimes conveniently right by the side of the road. (With some of the larger ones regularly state tested, for anyone who is concerned about the quality/safety of whichever generally small aquifer it might be coming from. You can also send off water samples to a local university lab on your own.)
Anyway, the one major factor in common there? All that mineral water is chock full of...minerals! Often largely calcium and/or magnesium--i.e. "hardness"--because karst! And the balance of that mineral content is most of what determines the flavor of any specific source.
You probably won't be happy with coffee brewed at Salt Sulphur Springs! (Used to be popular to treat certain skin conditions, though.) Some of it could be dangerous. I wouldn't necessarily feel great about drinking from any sources in the vicinity of Lead Mine Road, offhand. Not aware of any arsenic, etc., locally, but that's mineral content!
At my Nana's house, they needed a settling tank to let some of the iron oxides fall out of their own local water before it was piped into the house, and that mineral water leaves deep freaking rust stains on all the plumbing fixtures. The little spring pool just up the hill keeps a weird oil slick-looking iron film on the surface, and I used to get fussed at for messing around with it because that shit will stain your clothes and shoes. Minerals!
(Not from there, but a heavier accumulation of similar-looking stuff. Lack of water flowing through probably helps there. But, what kid could resist? 😁)
I can't even shower at one aunt and uncle's house, the sulphur-and-magnesium rotten egg stench off their unfiltered water is so overwhelming. Their well is on the same aquifer as a nearby old springs resort. Anything that vile has got to be good for you, right?! Minerals! 😒
Hard to describe the liquid chalk coming out of the tap in London as anything BUT mineral water, for that matter. Because it is coming straight out of extremely soluble calcium carbonate, and almost seems like more mineral than water! (Even to someone accustomed to limestone karst.) With the particular writer who prompted the little digression this time being based in London.
Main point here: the actual composition of spring--so-called "mineral" water--is necessarily going to depend VERY HEAVILY on the rocks at the source. Less aggressively soluble aquifer geology is going to produce less mineral-tastic water. Which more often gets bottled commercially, since it's much harder to go too wrong there in terms of drinking quality!
I could go on, but yeah. With more extensive experience of a pretty wide variety of Genuine Mineral Water™ literally spurting out of said minerals all over the damned place? I continue to find it darkly amusing, the way some terms often get understood and applied.





