The tap water in my house growing up in Eagle River, AK. The public water was filtered glacier water and still retained some of the minerals from that. It made the water a bit hard, but it tasted great.
IIRC at some point it was also rated as the best tap water in the country by some magazine or something.
I had well water growing up in East Texas. I have no idea what combinations of minerals caused it, but it was pretty good and plenty cold enough straight out of the faucet.
My grandmother’s bathroom growing up. It was honestly probably lead, because it was noticeably sweet, but it was the only water I actively enjoyed as a kid.
Wales, UK.. I call it frog water because the header tank up the hill got blocked by dead frogs in the pipe. Tank fault we drained it fixed it. Big old tank been there for many years. The water is from a spring. Unfortunate that header tanks are needed up the hill to keep a constant supply. Good old frog water though!
Hot Springs, Arkansas. They had giant public water fountains available on the streets for free to get water straight from the springs. Also some very cool bathhouses from the 1900s.
I'm from Melbourne and locals like to claim we've got the best water in the world but it tastes bleach-ey to me... because they put chlorine in it for hygiene reasons. It's not a health risk at the levels used, stomach acid neutralises it. After I got back from staying with family in NL I found the local Melbourne water disgusting and it took a while to be able to get used to it again.