Ugh I'd probably do DoorDash or some other delivery service- of go offsite if you have a car. Orlando area is FULL of great restaurants. We have cooked on vacation, but dining is a big part of vacation and I'd be so depressed to not only be cooking, but to be making "easy quick" meals like sandwiches or pasta. SO not what I want for dinner when I am on vacation!
If I had to, I guess I'd get a rotisserie chicken and bagged salad from Sam's with some snowflake rolls; people can make sliders or have roast chicken. Sam's pre-made meals are also good: Pot pie, chicken enchiladas, macaroni and cheese, etc. They have a variety of bagged salad mixes (Sweet Kale, Southwest, Watermelon Crunch, Asian, etc) that are easy, provide variety (and nutrition), and aren't too expensive ($2.50 a bag?).
SO... can you really get no table service reservations anywhere, none of the resort hotels or Disney Springs or anywhere? I am not a fan of QS in the parks, but many of the places at Disney Springs are a cut above the QS park fare. Good luck, and keep trying for reservations. I think people are booking multiple reservations- there seems to be a panic about getting ADRs- and hopefully things will open up as it gets closer to your trip.