A source of very hot tap water. I use water from my home hot-water heater. I'll turn up the temperature control to the maximum. Three 5-gallon plastic buckets, with tops. I purchased these from a local fast food restaurant.
Restaurants acquire plastic buckets when sliced pickles are purchased.
Shop around for the best buy. Plastic 7-8 gallon size round trash can. This container is used when mixing the gelatin into hot water. The inside surface should be as smooth as possible which will be helpful when cleaning. The thermometer I use is graduated in two degree increments from zero to 212x Fahrenheit.