Asian that’s moved to the U.K. here.
Back home, when I grew up I’ve never drank tap water. In my college days I was way too lazy and started just drinking it with a cheap filter. Surprisingly I survived for 5 years despite everyone around me telling me otherwise.
Now in the U.K. I’ve always drank straight from the tap. It’s surprisingly refreshing! And the boiled water taste I can’t really get used to again when I visit home.
The water in Iceland is safe to drink from the tap. Although if I recall correctly it’s pretty sulfuric due to the local hot springs.
I’ve visited a few countries around Europe and have always enjoyed sampling their local tap.
I’ve always seen it as a contract-like promise that you’re telling the truth. So if you weren’t, you can be charged with perjury, which used to come with much more severe punishments.
Much like the odd statements on visa forms where you promise you aren’t a terrorist or have committed genocide.