I'll do a 180-

In the Desert Southwest, I used to freeze water bottles (even nalgene), 7/8 full, and let them thaw as I traveled, bike, hikes, etc.

Same with food, freeze it and use it and the bottles as the "ice" in a cooler, as it thaws eat it.

No ill affects, except condensation leaving a wetspot.

With the MRE's, I found the little jelly packets would burst, so I took them out. Not enough airspace for expansion I guess.