The main language of Germany is German, yet many here also speak English because it is required to learn in the schools. There are also a lot of immigrants who speak other languages. Two of my roomates, for example, speak Czech.
The Euro is used in all of the European Union. Many places in Germany also still only take cash, but that is slowly changing. Before 2002, though, Germany used the Deutsche Mark (DEM).
A bottle of water is only 15 cents + 25 cents pfand (a tax which you get back when you recycle). Recycling is a big part of German culture. Not only do you return plastic bottles and cans for money, but we have three different trash cans and there are special bins for different color glass in each neighborhood.
My favorite meal this week was Döner - a type of Turkish food that involves thin shaved meat, vegetables and sauces inside of a flat bread. My roommates were really nice and shared the chili con carne (meat chili) they made with me.