Eat breakfast in the room. Join a Fridge swap if you can find one (if you are staying at a value)
If renting a car check Alamo and/or National often using different codes. Prices can change daily. Use code from Entertainment book if you have one. Use link through mousesavers.com to join Nation's Emerald Club for free (normally $50) Im getting a midsize for 10 days for under $180 (complete) and I will be able to pick from any car in the Emerald Aisle. Last year we got an amazing Buick Enclave with all the bells and whistles! So cool!
Share meals-many are splitable.
Bring frozen water bottles into the parks (during hot weather)
Get the free water in the parks. If you don't like the plain water bring flavor tubes with you.
If you like hot tea or hot chocolate bring tea bags or hot choc. mix with you-you can get hot water for free in the parks at any place that has it.
If you'll have a car, stop off at Super WM or Super Target and get basic food supplies. Water bottles, sodas (if you won't have refillable mugs), breakfast items, snacks, fruit, etc.
Pick up an inexpensive toaster for the room for breakfast. Great for poptarts, toast, bagels, etc. If your room is pretty far from the food court it will save you time in the a.m. by having it in your room.
Bring snacks and sodas into the parks. It's allowed.
Bring stroller from home. Load up the stroller the night before in your room for the next day and you'll be ready to go first thing in the a.m.
Bring soft sided ice chest (the kind that collapses) in your suitcase if you won't have a fridge of even if you will. You can put a small one in a stroller basket or I now take to filling it with a lot of ice, water, and sodas, and leaving it in the car for when we return to the car in the heat of the day. It's great to have a nice cold beverage to look forward too!
Probably too late for this but if you can fly Southwest. No luggage fees. 2 free checked bags per person. And you can still do airline resort check in at most resorts.
If you can't get to the grocery store yourself, bring what snacks you can in your luggage and/or have a grocery company deliver to the resort.
That's it for now.