föderal umdrehen

I would definitely suggest losing the second i at the end, that looks weird. Or maybe go for “Vitaly” (which you can tell people spells like V + Italy).

(Incidentally, a couple years back, I had email contact with someone named “Vitalis”, which I thought sounded like a female and vaguely flower-y name. Only when we finally met in person did I notice he was male. Somehow he didn’t seem too irritated by me having misgendered him in multiple emails though.)

Not really sure if it is frowned upon, but I don’t think I’ve ever seen people ask for tap water in a restaurant in Germany unless they wanted water for their dog.

Drinking tap water has become much more socially acceptable since the 90s, however. I am hopeful.