I don’t know if POR has an age limit for the fifth person or not, but I can guarantee that the pull-out trundle bed is very, very small and would fit a kid, but not an adult. Fortunately, kids think it’s cool, so they enjoy the little mattress!
Anyway, I wanted to add that if you are looking to save $ on your dining, it sure can be done at WDW. May I ask if you will have a car? If you have one, there are even more ways to save on food.
The POR food court has some incredible breakfast cinnamon rolls that are easily large enough for two people at breakfast. And if you invest in refillable cups, you will save a lot of $ that way, by getting coffee and drinks whenever you like. POR is one of the best places to use the cups, as the machines are readily available.
The food court also has a ton of lunch and dinner options – I can’t say enough about the food court here, because it is the best of all the hotel food courts on property and you will definitely find ways to have your meals at great prices. There also is pizza delivery at good prices too, so you can dine in-room if you like.
From POR, you can also take the boat to DTD/Marketplace, where there is Earl of Sandwich and Pollo Campero for delicious food and good prices. Plus, the boat ride is a great way to get to dinner, right?