Bro, it got about Alien 3 levels of bad. In Ethiopia we shut that camp down so the last month or so we were supposed to live off of MREs. They stored the MREs in an outside bathhouse that we couldn't use because the water if it got in your eyes could blind you (there was a mobile bath house of US design that ran off a water tank that got packed up and sent, and an inside shower that had the same water as outside but just keep the water out of your eyes). Anyways, the drain backed up from a sewage failure and shitwater went over the top of the MRES.
MREs are sealed and were probably fine internally, but there was no way I was going to eat shitwater MREs for anything short of a major world war, a nuclear war, or a zombie invasion.
So I had a month of nothing but eating blueberry poptarts (one of the reason I got down to 159) as they were the only food that was left over for that month because everything else got eaten already or sent back. By the end of the month I couldn't eat them without triggering a gag reflex.
I think I went out to town a couple of times and ate, but I had the day shift and could never leave except when I had a day off. Ethiopia isn't like the US. If you aren't out and about during the day when everybody works, then no business is open.