My group and I came prepared, and as a result, none of us went hungry or malnourished all weekend. We brought one cooler (which we filled at the hotel from the ice machines) and used the hotel-provided coffee maker to heat water. We had various sandwich fixings (including both normal sliced bread and actual loaves of bread, and a simple slice of bread with jam or butter is a beautiful snack) for both meat sandwiches and pb&j, milk and cereal (the cheap-o offbrand bags, which taste just as good), granola bars, fruit bars, baby carrots, oranges, pears, string cheese, and pudding. We also had a case of bottled water, and those flavor packets to make it lemonade, as well as 3 different types of hot tea. We also brought like 4 Cup Noodles, and they went uneaten because there was so much more satisfying food available!
All that for 15 bucks a person, and we were all fed all weekend, including a few moochers. (We went to Jack in the Box once for shakes. XD)