I know a little German....
I’m surprised it’s the 21st century, well into the digital age and we have to remember [cue the shrieking liberals] CLIMATE CHANGE...lol...
and nobody has mentioned a solar charger...who needs a wall plug, adapter, convertor or even a room to bring it to for that matter...
I have one, keep it on the dash and I always have a charger for the cell phone when I leave the house. My Samsung seems to be picky, I haven’t found one yet that works, except the power brick I have to charge at the wall outlet or the 110V wall wart charger it came with...
https://www.toptenreviews.com/mobile/accessories/best-solar-phone-chargers/
I Got mine at a yard sale for a couple of bucks, works fine, thinking about a bigger one though, it’s not all that great. Still, works to top off the battery in the phone or tablet when I need to, no wall plug needed.
When I went to Germany the internet was 20 years in the future, our band went to the 1st International Band Festival in Vienna. I took a walk when we landed in Amsterdam, found something that looked lie a hardware store, walked in with the power cord to my electric shaver, and using mostly sign language, the guy behind the counter, with a big grin, handed me the adapter I needed.
He seemed to be very pleased that all this pointing and gesticulating had resulted in finding on his first try, exactly what I wanted. Of course, I let him know I was pleased too.
I knew about 6 words in German, enough to say good morning and thanks, and probably enough to get myself in trouble...and it cost about a buck if I remember correctly...
Don’t drink the water, on average most european water at that time had already been drunk at least 3 times...before we left they told us drink cokes or beer...well actually they didn’t say beer, we figured that one out ourselves, being incredibly, amazingly intelligent high school guys...and yeah the beer was good...no, I didn’t fall down the stairs...
The water is usually what causes that day or two of mad dashes to the bathroom...and you better know how to find out where it is...quick...I think it’s called Montezuma’s revenge...basically, you’re not immune to the bacteria in their water. They are.
Bismuth Sulphate seems to be the best treatment, also known as Pepto Bismol...the tablet form is small and easily packed.
Your band must have been on some pretty good s(tuff). Surprised you remember anything about the trip.
Amsterdam is in Holland, not Germany. They speak Dutch, not German. (They also universally were fluent in English.) If you had tried English instead of German, you might have had a nice chat).
I know a little German....