My son has a condition called monoclonal mast cell activation syndrome. He cannot eat nuts, eggs, fish, dairy, chicken, wheat, turkey. Anything with dyes and preservatives makes his mcas flare up. 

How did I fly with my son to Israel? It took months of preperation and planning but bh we nailed it. Here are some ideas that can help you travel abroad with a child with so many restrictions.

Plan early and every week put aside some food to vacuum pack using a Vacuum pack sealer and Vacuum Sealer Bags

Here are some allergy friendly ideas of what you can make and freeze.

Egg free potato kugel, Egg free latkas, shepards pie, oat challah, egg free burgers, egg & gluten free donuts, gf egg free breakfast muffins. chococolat covered rice cakes, cookie, oat danishes. Most foods need to be frozen first and then its easier to vacume pack. If you plan on vacume packing kugel. Put wax paper in your aluminum pan and after you freeze the kugel you can slide it right out of the pan and then vacume pack it immediately

How to travel on the plane with all your frozen food?

This amazing insulated briefcase kept our food frozen. We used these ice packs with it 

There are outlets on the plane and you can use a hot logic food warmer to warm up your food or this electric portable oven  which can be used with a regular outlet (on the airplaine) or a car outlet (it comes with 2 plugs). It also has the added benefit that it works in both the U.S. (110V) and Israel (220V). You will need to buy a adapter like this if you want to use it in Israel.

In israel they sell a betty cracker that can be used  in israel do not bring the one from america. Its not compatible with the outlets there.