I would say that yous should bring anything you need that is a specialty item that is hard to find, because Wally World probably won't carry it -- Body Glide comes to mind, because WM's in Orlando don't. Otherwise, yeah, sure.
Only one thing: please bring something to put it all in so that you don't show up at your hotel with nothing but piles and piles of WM bags. We were behind a guy once at the Swan who had done that, and it was obvious that the desk clerk thought that he might be a credit risk.
Do pack a meal, though, perhaps even two for that much travel time. Remember that if you like your condiments on the side until you are ready to eat, you'll need to carry them in your 3-1-1 baggie; same with things like yogurt that are gels. At very least bring some hearty packaged snacks that will ward off hunger if you get stuck on a runway.