Based on the actions of the characters, there was no 9 months supply cache, no air dropped supplies, and no contact from John Stewart to get supplies. There also seemed to be John spending literally every moment looking through the scope.
While I appreciate the intent to make him seem badass, it boggles the mind that he could spend 9 months radio silent in the middle of nowhere after a highly dangerous insertion, and still be upset that his handlers didn’t trust that he was still on mission.