Shopping for anything other than clothes, on sale is not my favorite thing to do. Grocery shopping is at the bottom of my list for "fun things to do" and even lower if that is possible, while I am on vacation.
If shopping for groceries at unfamilar places while on vacation isn't your idea of fun, check out Garden Grocer http://www.gardengrocer.com/. They'll do the work for you and deliver right to your room at your timeshare.
You can order just about anything you need or want on vacation and there is only a $40 minimum, which shouldn't be a problem. One of the best features is that for orders over $200, there is no delivery charge! Orders under $200 carry a nominal $12 delivery charge.