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Here are some great potato facts:
http://idahopotatomuseum.com/potato-facts/
Andy Wier was right (The Martian) of course, potatos can be grown in space (the first vegetable to have that honor), and is a near perfect food (take that legumes!).
So, you could survive in space with a potato (and an oxygen filled, radiation proof habitat of course [and water, duh]).