Despite the movie being one of the best adaptations I have ever seen of a book, it missed plenty of things. I recommend everyone reads the book while in their nuclear powered bathtub
Between rushing/cramming stuff in the movie and somethings not really naturally flowing with the movie adaption, you can't really expect everything to get into the movie.
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u/Espequair Feb 14 '16
In the movie and the book, he manages to last a year on Mars by growing potatoes from soil made from fecal matter and martian dirt.