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Drinking tap water is safe all over the country. You can usually get inexpensive but good food at Italian and Turkish takeaways, the latter ones have ''Döner'' or ''Kebap'' written on them. Typical German fast food shops are marked with ''Imbiss'' signs and sell cheap sausages and French fries. Keep in mind that most shops including some supermarkets are not allowed to be open after close at 20:00 and on Sundays, although many supermarkets might be open until 22:00 during weekdays. Petrol stations, 24-h shops and kiosks have a very limited food choice and are more expensive. As a free alternative you can try dumpster diving. More information on this can be found in the [http://trashwiki.org/en/Germany trashwiki article on Germany].