I've only been in a Publix on vacation, but it seemed like a very nice store with lots of pre-prepared items.
We almost always rent VRBO homes and cook on vacations, even when we are doing road trips and aren't in one place for more than a few nights at a time. The money savings are huge, after sight seeing most of the day I don't want to get dressed and go out (and mange 3 boys in a restaurant), and I don't gain nearly as much weight! However, it is vacation, so I don't want to spend a lot of time cooking. So, I go into vacation mode shopping, when I allow more expensive, convenience foods, and some unhealthy indulgences.
When we are driving somewhere, I like to bring stuff that is already prepared. So, I may have steaks frozen in marinade, lasagna in One of those disposable aluminum pans, things like that. If we are flying, then we will go to the grocery store and get things that can be grilled (most condos have grills), like chicken breasts, Bubba Burgers, steaks, hot dogs, etc. We will then grill everything all at once, so we are eating left overs and not cooking every day, and I'll just get some frozen vegetables, salad fixings, etc to go with them. Other things I've gotten are frozen or deli pizzas, rotisserie chickens, things like that. My kids love fried cheese mozzarella sticks, so Im good with that kind of stuff being dinner on vacation. Tacos, spaghetti, anything with ground meat would be easy to make (and, if you're driving, you could pre-make the meat and freeze it in ziplock bags, making it even easier).
I also find that we never need as much food as I think we will, so don't over plan! Have a great time!