When my grandfather couldn’t get Kosher food, meat in particular, he would eat fresh water fish. If there were no (yucky tasting, local fresh water) trout or similar to be found, the next choice was a McDonald’s fish filet or three, no bread, and of course, jalapeno peppers.
I grew up in New Mexico. My grandfather grew up in Zhytomyr, in the Ukraine, but he adapted well, to everything. Including McDonald’s in Las Cruces, although I am certain that he would have been very curious to try a Kosher McDonald’s.