I just got back from Christmas and New Year's in Seattle, where my days were filled with seeing family and friends and lots of eating - including lots more eating out than I normally pack into a 2-week period. I got to eat lots of Seattle favorites that aren't so good in Berlin: oysters, seafood, pho, Mexican. But the way I can tell I'm in America? The abundance of ice water when I sit down at a restaurant. I love it. I extra-love it because now I live in a world where it is normally denied to me. There are actually two aspects to this that are unusual in Germany: (1) there is abundant free tap water placed in front of you when you sit down at a restaurant, often without you having to ask, (2) the water is full of ice.
It is actually the first aspect that I miss the most. Many restaurants in Berlin will give you free tap water if you ask, but it is not unusual for it to come in thimble-sized classes. It is also possible that when you ask for tap water, you will get the response, "we don't do that." This makes me immediately grumpy towards the restaurant, and most of the time I have stopped asking because when I am denied, it puts me in a bad mood. It goes without saying - if you are served tap water, it will not be cold.
Drinking room temperature water is actually totally fine with me, unless it is really hot outside. The icy drinks I miss the most? Iced tea and iced coffee. If you order "Eis Kaffee," pronounced "Ice Cafe," you will get coffee with ice cream in it (which doesn't work for this dairy-avoider). Sometimes at specialty places in the summer there will be iced tea on the menu, but this is the exception. So to get my fix, I have to make iced tea and iced coffee myself at home, with my American-sized ice cubes.