Amsterdam. It didn't taste like anything.

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.