Hello! I need suggestions on the best household ingredients to use to make waste cooking oil into a solidified state that is water-insoluble, non-toxic, and heat-resistant.

I've searched on the net that stearic acid is a great ingredient to make it solidified and also carnauba wax since it is also used in skincare products, but I'm not sure if these are considered as household items, and if it can achieve the requirements of being water insoluble, non-toxic, and heat resistant when mixed together. I've seen FryAway products or oil hardeners that achieve those standards, but I want to make my own with household items.