The Cauldron symbolizes the Fire. In cast iron or terracotta, it will be useful for all the preparations of magical recipes: burning incense, boiling recipe ingredients, mixing herbs...
The Chalice is the element of Water. It contains water, liquid or wine dedicated to the goddess. Consecrated virgin of any use, it can be made of glass, wood or other metal.
The bowl symbolizes Earth. It is used to place offerings on the altar, to receive herbs, stones and talismans or to contain incense, oils or salts. Choose the bowl material according to its resonance with the elements.