My best tip has already been mentioned and that is to eat a huge hot breakfast at your house/condo before arriving at the parks. We have not done this at WDW as we always stay on site but did at another park when we traveled with friends and rented a house. Saved us a ton of money with four tween kids that liked to eat. I was mostly the breakfast cook as I was up first, but we tried to do things that we could prep ahead of time. I made a breakfast casserole ahead of time and stuck in the oven as soon as I got up. We precooked ham on the grill the night before. Eggs scramble quick, oatmeal can cook in a crock-pot over night. Stash snacks that can handle heat in your car in case someone wants a quick snack before entering the park, and have something in the car you can eat when you leave the parks if everyone is starving. Also have quick food back at the house for late night snacks to avoid fast food places returning to the house at night. We have not taken meals into WDW but have done very pleasant packed lunches other places. With a good cooler that will keep things cold, you can do a lot. We prefer meat salads and pasta salads to sandwiches. Roasted deli chicken is yummy too. We have peanut allergies but for most families nut are a great easy protein food. Lockers to hold the food works well but there are limits on sizes of coolers. At parks other that MK it is possible to leave lunch in your car and return to your car to (depending on the weather) to eat there or maybe find a place outside the gate to eat. CS meals can be shared sometimes and its easy to carry simply snacks with you if your want too. You can choose to budget cut as little or as much as you need and want too. What we do is to choose to budget cut our meals at home in the weeks leading up to WDW and add that money to our trip food money. I would rather eat pasta and eggs a lot in the weeks leading up to our trip and then eat when we want on our trip. It just works for us.