If your food stash goes missing, you could get very hungry!

I often travel to places where the quality of food is an issue. For a few days prior to purchasing your travel food, keep track of how much you actually eat. Figure out how bored you are willing to be and purchase accordingly. Buy a new 'put in cup' water boiling device (a few dollars) and a package of heavy duty coffee cups with lids (such as you would get at Starbucks. You can make soups, teas, coffees etc with your own cups and water boiler. I always carry little packages of oatmeal. I don't know if they come in Kosher for Passover versions. But you can really survive on them. I've done it.

Buy some very special items for treats. Don't forget to pack meals in your carry on bag! You can buy fresh fruits along the way, correct?