lisa...i really wish i had some answers for you!!! i have yet to find anything, and i mean ANYTHING that is IP that REHEATS well. I am fussy about textures and do NOT like rubbery textures.
i have had NO luck with muffins!!! they always deflate and have a rubbery texture even though the taste is pretty good.
the jalapeno buns....are the only thing i found that i like cold. they make a pretty good ham sammie!! easy to pack.
when i travel, i am fortunate to be able to take the magic bullet as it is compact and plugs in just about anywhere, even the airport!! i was able to take it in my carry on with no issues. so i made lots of drinks when traveling and relied on the restaurants i researched BEFORE hand...so i knew what to order in advance.
my advice would be to stick with the drinks and restricted packs of chips, puffs.
kale chips worked perfectly for me. they kept amazingly crisp for 5 days!!!
maybe even try phase 2....while traveling....because you can always find a subway practically anywhere these days!! salad with some meat added. i would easily do half the protein amount in turkey and half in a drink. i didn't mind adding half a packet to the bottled water....OR subway salad with half portion of meat and then have a half portion of a restricted pack of chips!!!!
i wish you all the luck!!!!! pre -planning is the key for sure!!