In the spellcraft pot and cup has close meaning to eachother. Both are container of the goddess, a symbol, her’s powers bridge. There are no certain rule about essence of a cauldron, other than, it must not be made of steel, and it must be a kitchen tool.
There can be many kind of cauldrons, but most known of these is the three-legged cast iron cauldron.
Blessing of the Cauldron