Water as an amulet.
It is said that water is the only element that is present in all astral planes, and therefore serves as a link between all of them. In addition to having the ability to transmit psychic energy. Hence, a glass with clean water can be used to transmit a message
to another astral plane or to increase telepathic waves.
On the other hand, water also serves to clean negative energy, especially when it comes to salt water, since it absorbs negative energy, hence it is even used during exorcisms.
It is also used as signs since water is one of the five elements (Water, earth, air, fire, movement), which actually refers to the ways in which matter manifests, but the point is that it is frequently used as a sign, as it is in some methods to prepare amulets and talismans.