In Germany nobody drinks tap water. Just the notion makes as much cultural sense to them as drinking water from the toilet cistern does to you. It is just not the done thing.
Have you tried their beer? And why are you asking for water in the first place?
They always serve beer with extra consideration and thought put into the bierdeckel. You just don't get bierdeckel everywhere, this is quite a German thing, a matter of pride, customer service and a job well done. However, walk into an American bar and ask for a bierdeckel and you will get a blank stare. Even though bierdeckel are 100% safe, American waiting staff just don't want to do the kindness. To them any insistence on a free bierdeckel is just weird.
As for air-con in Europe. This is the last thing we need.
There was a time before air conditioning when it was possible to heat and cool buildings. The trick to it was not difficult, you just needed a stone or other robust building that takes a while to heat up during the day. A breeze running through the building due to having attic windows open and the front door open did a better job than any 110v fan. This was convection, just normal heat rising, with no external breeze needed.
This also worked well during winter albeit without the windows open for the cooling breeze. The physical mass of the building would keep it warm inside even if there were no fires in the hearths overnight.
America is different in that buildings are made from a few bits of wood and some PVC decorative covers. The specific heat capacity isn't right for natural cooling and, with the more southern latitude, the only way to survive is with air-con. This applies to the clammier parts of the American South as well as the dryer desert areas. Living there needs air-con. This is probably why people didn't live there in such vast numbers in the days before air-con.
But air-con is like a disease. People get used to it very easily and have to spend the rest of their lives with it. People are also vastly more spherical than they used to be and their lives are sedentary. As a consequence they can't regulate their own body heat. Their only option is to not enjoy the seasons and splendid weather, to be boxed in behind their noisy air-con machines with the windows closed and none of that natural temperature management that used to go on in former times.
As soon as the fatties that need air-con completely take over then that is game over for buildings that have served us well over the centuries with well considered solutions for natural temperature control.