Definitely beer, man! If they forget the beer, the spacemen will be rioting in a week.
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That is why the Pilgrims ended up in desolate Massachussets...They ran out of beer to make it further south to better living conditions.
Organic matter is edible only when its biochemistry closely matches that of the consumer. Even on Earth, the vast majority of organisms are not suitable for human consumption. There is no reason to suppose that terrestrial biochemistry, which is highly specific to both the conditions on our planet and the accidents of evolutionary history, is universal.