As there is a website for everything, a facebook group for everybody - there's a water bottle, for sure! I got one at the "International Students Orientation Event" (in addition to a bag) which turned out to be very useful since I was living on normal plastic bottles I had bought in a supermarket. As far as I can remember, most people in Germany carry "normal" water bottles as the supermarket ones, but at a meeting here you see all kinds of water bottles with slogans, advertisement by the local newspaper or whatever. The grass gets a colorful touch when we put our bottles down during training since some of them are bright pink, blue, yellow ... - very clear to see.
Thus, after your smart phone, there's the water bottle! (But maybe that's mostly in California the case since it's a "bit" more dry...)
