Correct me if I'm wrong, but I think the EU has regulations that say tap water should be drinkable as-is.

That said, in some places it may taste a bit weird - and by place I mean even in the same city. I live in a city in Hungary, lived in four different buildings on different parts of the city. 3/4 the water was fine 99% of the time, though the fourth one was absolutely nasty. Didn't live there long luckily.

Because hexagons are bestagons

If you just want to watch people play, there's tons of shows. Critical Role is the most famous - just keep your expectations for an actual game a bit lower, the people on the show are professionals and they are there primarily to make a good show and not just to have fun with each other.

They also have a series of short videos called Handbooker Helper where they explain different aspects of the game.

If you want to learn the mechanics interactively, I'd recommend you pick up Solasta: Crown of the Magister. It's a 5e based video game that explains the mechanics quite well imo. It's also played on a 3D grid, which is most likely how you will play the game irl. It's also available on Xbox Game Pass, with crossplay with Steam and a great co-op mode with up to 4 players. Baldur's Gate 3 is coming out in early August (on PC at least), which is also based on 5e but I'm not sure how well it explains the rules. It will probably be a great RPG experience though.

Divinity Original Sin 2 is on there too, which is literally the best of the genre. There's a mobile port of Fallout if you want to play a good old turn-based game. Baldur's Gate 3 will come out on PS5 in October iirc.

Depends on what you and your table want to focus on. The mechanics are there for a lot of things, from hitting stuff to talking to people.

There are also other games that focus on different things. Pathfinder for example focuses on the more granular aspects of things (for example you have a different Armor Class for touch attacks, regular attacks and whenever you're off your feet) but there are lots more. Recently Overly Sarcastic Productions made a video where Red's sister talked about a bunch of different games, check it out if you want.