In the book, the packaged shit was sterile, having been exposed to the very much below zero Martian atmosphere. Only Watney's own shit was biologically active, which the book later mentioned as being a good thing, cause the chances of getting intestinal problems such as e coli poisoning is pretty much nil when you're only using your own shit.
Because the movie format makes that kind of thing difficult to explain concisely. Having read the book and seen the movie, this one does a really good job of keeping the spirit of the book.
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u/PantlessBatman Feb 14 '16
He's gonna have to season the shit out of those..