The gutus is a container for sacred milk or wine that is offered to the gods. As with the acerra and the salinum, the gutus is used to keep a sacred offering substance clean and protected. Any of a variety of materials may be used, such as pottery, glass, stone or metal.
Liquid from the gutus is poured into the patera when it is being offered to the gods. If you are offering milk to the gods it should be placed in the gutus only a short time before the rite in which you will offer it, and the gutus should be emptied afterward. Wine may be left in the gutus for a longer time, although care should be taken if your gutus is made from metal. (The acid in wine may corrode the metal if left there for days.)