My "must list" includes: Metal Crockpot (squarish type that sits on griddle and has a glass lid). Base can be used as griddle, metal pot goes into oven. Fits one large chicken perfectly and only the glass lid need be carried in "carry on"!
Oven bags (can hold pot roast, salisbury steaks, chicken or a turkey breast, etc.) Perfect for crock pot, glass baking dish or fast cleanup of any tray you may use. (be sure to have a bit of flour to coat the bag before use)
Non-stick frying pan (one large one with non-stick turner can save a lot of clean up time over stainless. This packs easily into suitcase.
Laundry bags (mesh)
Sandwich bags (for lunch sandwiches, veggies and fruit carried into park to avoid too many expensive and high calorie snacks)
Ice packs, hot packs, and an Insulated cooler bag or two (for carrying hot food into park; we've had some delicious hot meals on a cold evening along the parade route, the only problem is you make others jealous!)
Paper goods (plates, plasticware, small SOLO cups) to shorten clean ups.
microwave popcorn (small, single serving bags so popular at Halloween), great to plan in advance for parade sitting, or late evening shows!
Non-glass thermoses, again, great for tea, coffee, or soup during chilly evenings
Recently, I have become a Keurig fan, and I would have to consider bringing my personal size machine along to get a good, quick cup of coffee that still costs only about .30 cents!