The solution we tend to do in that situation is to try and pack items in our luggage.
The selection at the resorts can be, in my experience, a bit hit or miss. The Dolphin has a place called Fuel that has some nice selections, if a bit pricey and you happen to be visiting over that way.
We also tend to have a car, and we almost always get some bottled water, so if we need food - personally- we tend to just pick up food at the same time. On recent trips, we were able to do a pick-up order at Target. That was super quick and easy for us.
One option I really like is to buy shelf stable milk boxes for my coffee. You can bring them in checked luggage. Sometimes you can pick them up in the airport too, with kids' meals, though a bit $$. (Horizon milk boxes are often sold chilled with kid meals or solo, but are shelf-stable.)
Come to think of it, I have done that too: bought food items at MCO to eat for breakfast. It is $$ for what you get, but it is quick and easy. Depending on where you are staying, if you do online check-in, hiking over to the hotel gift shop can be somewhat inconvenient.
If you are NOT at a DVC room, then the dorm fridge also leaves much to be desired. Important to know: the newer ones at the Contemporary aren't even dorm cubes. They are ONLY 'beverage chillers,' and NOT very cold. You can chill water, but they are not cold enough for most perishable dairy/meat at safe temps.
