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I have to say I’ve never seen people let their water sit or boil it, and I’ve been all over the place since 2010 in Spain. I know for hard (not heavy :)) water you can install (expensive) systems between the incoming water and your taps that can soften it, but I don’t know how common they are. I would drink the tap water from any town in Spain without a second thought. Wouldn’t you? A finca in the countryside, I might be sceptical, or a service station in the middle of nowhere, maybe not, but any “built-up” area, for sure.
Excellent explanation, thanks.