Swan and Dolphin have Java and Fuel. I've only been to Fuel, but it's open early and it has fantastic sandwiches (hot breakfast sandwiches, too) that are well worth the prices. You are also within easy walking distance to that Speedway gas station that everyone says has plenty of stuff for room snacks to load up on. You'll also have the general store thing at Boardwalk, and Picabu at Dolphin has some packaged things as well. If it's open, I'd suggest Picabu for simple, quick, hot breakfast as well.
My best strategy for my fam is buying a few boxes of non sugar laden cereal, fruit, and trail mixy type things along with paper bowls and plastic spoons, and some form of milk for the room fridge. The shelf stable milk works best - you can leave one in the fridge and leave unopened ones somewhere else to save fridge space. We are early risers, so we get a decent non sugar crash inducing breakfast in before we leave the room in the am and hit rope drop ready to rock, then we do early lunch and early or late dinner to avoid crowds everywhere the entire day. Stop at a grocery store on your way. Most car services, and rideshares are completely aware of ppl wanting to stop for groceries on their way to Wallyworld.
