Our tap water here in Norfolk UK is exceptionally 'hard' and bungs up the dishwasher, washing machine and kettle with scale. But it tastes quite all right, and I've drunk it for forty years. Glasgow tap water was 'soft' and silky, lovely stuff.

I've never had bottled water. It's very expensive and I can't see the point. If one wants to take some water out on a trip (and I find this a bit mad. People go around clutching their water as if they're in the Sahara desert!), why not fill a bottle from the tap?
I'm really old, and still have all my teeth. They're not yellow, they're nice and white. And I don't have osteoporosis. Perhaps the calcium in the water has helped keep my bones strong?
(Although that could be down to the gallons of milk and oodles of cream I get through, not to mention the mountains of butter on all the crumpets!)