Deustch! German!
The main currency here is Euros.
I don't think I've ever bought a bottle of water here because the water in Vienna is widely accessible and extremely clean. If I'd have to guess, a bottle of water would probably cost 2 euros. However, everyone drinks tap water here-- from the bathroom sink to the kitchen sink to outdoor fountains, it's all tap water. Vienna also pushes for sustainability options so almost everyone has a reusable water bottle, like me. With the water in Vienna flowing from the Alp springs, you can truly taste the difference. Personally, I think that the water here is delectable. I can't imagine drinking tap water in New York, although I've heard New York has one of the best water in the states too. It'll for sure, be one of the things I'll miss about Vienna.
Learn more about the water in Vienna:
https://www.wien.info/en/sightseeing/green-vienna/viennese-water-364316
