Look in the big box hardware stores for a material that is coated with aluminum foil and use aluminum tape to put it together. You may find something that uses fiberglass and the aluminum etc. I think the purpose of a coozie is to keep things warm after you heat the water and mix ingredience. To insulate your cook pot, I have coated the bottom with high heat header paint and the sides of the pot with high heat silicon gasket maker. Very ugly but does the job. A lid is very important also.