I'd suggest planning on some days with a later breakfast (like Chef Mickeys, Crystal Palace, Cape May Cafe, Ohanas...or, my favorite budget breakfast, Trail's End in Fort Wilderness) and then a late lunch/dinner (there are a few Epcot restaurants that I know for sure serve lunch until 4pm-4:30pm) with a snack to cap off the evening!
Also don't forget about bringing filtered water bottles for eveyone in your family (or a few to share) and stick to water at your meals...that only can save you muchos dineros. We always bring snacks to bring with us in the parks-stuff like pretzels, cheese-n-crackers, nuts, and starburst. We find eating breakfast in the room before we leave for the parks saves not only money but time-poptarts, bagels, juice, milk-n-cereal. This stuff is even easier to store not that the moderates and deluxes have in-room fridges. If you are driving down (which we did for the first time in August for our 10 day stay), bring a cooler and bring sandwich stuff, chips, pop, etc. too. With all our food supplies this past trip, we were able to get down to purchasing one meal and having the other two meals in our rooms (don't worry-no cooking was done!). It was easy to accomplish because we would eat breakfast before leaving early for the parks, and since we were there in August, we came back to the room about 1pmish for lunch, swim, nap, etc. That left us able to have dinner out when we got back to the parks. Of course, we would sometime eat lunch before going back to our resort for our mid-afternoon rest, allowing us to eat in our room (dinner) before we went back to the parks with a snack at the end of the day.
If you have been to WDW before and/or are familiar with the area, I would highly recommend taking a few meals off-site. Really and trully, though it might be considered "heresy" on the DIS, it isn't that much of a hassle to go off-site for a much more affordable meal for all family members. DH and I found our way around Kissimmee quite easily. If you go that way, try out the Entertainment book for some buy one, get one free options. You may also want to check out
www.restaurants.com for coupons for off-site dining.
You can buy a double cheeseburger and ask for a separate bun.
If you are Florida residents or AP holders, you may be interested in the DDE which gives you a percentage off each meal you purchase in WDW.
Have a wonderful vacation!
IVY