The question is, how are you going to get from Madison to the Dells. It is about a 45 miles. A cab or Uber would be very expensive. Food at the resort is limited and a little pricey, but then all of the food in the Dells is pricey. There are restaurants and an outlet mall within walking distance, less than a half a mile. But for milk, and other groceries, walmart is your best bet. Another option is Amazon Pantry, order and have it delivered to the resort. We did this at Disney because we didn't rent a car, It worked out well.