Depends on where you are travelling. I managed to get the chef to cook for my boy according to my recipe during our holidays.
Alternative we did was to bring a good thermo flask (for porridge), a small kettle and raw ingredients (mostly grains & vegetable). Wash & place ingredients inside thermo flask, boil hot water. Pour in once boiled and quickly close the thermo flask. It'll cook in around 4-5 hours, depending on quantity.