I travel quit a bit, out of the country only to Aruba and Mexico which is a pretty short flight. But whenever I fly in the country I always take nuts, go picnic meals, or Snyders pretzel sticks and the individual "bowls" of Peanut butter. Those types of things always make it through security in my carry on. For my checked luggage (probably the only reason I have to check luggage) I pack cheese that doesn't need to be refriderated, skinny cow or something like that, crunchmaster crackers, pepperoni and things I can open and refriderate when I arrive, individual bags of instant gluten free oatmeal work great for hotels. In the grocery store of other countries I only found fresh meat, fruit and veggies to be reliable, everything else was usually written in something I couldn't read, so I didn't take a chance on anything. Personaly I don't travel with a crockpot, or hot plate or anything like that I do a lot of research and send emails to restaurants asking all the questions I can and I take that email printed and aske to speak to the person who answered me if I need to. If I don't have time to research that is trickier.