Thanks.

You mean e.g. this techy thing at the end of the inlet tube right? It's electrical and only opens when the machine needs water, correct? I think I read a warning about electrical hazards for this plastic tube.

On the downside, this valve probably doesn't allow flushing the inlet with some hypochlorite solution easily... Well knowing the drinking water is safe helps. Hydrogen sulfide is detectable in such low quantities, I am probably stressing over very little contamination anyway.

I wonder if you could reconstruct the whole of "western" civilization just from norms and regulations :)