The elements of Water and Earth are represented on the altar by water and salt.
The salt is preferably sea salt, but table salt, though acceptable, should be regarded as a last resort.
On the Alter
Place your water to the left of your altar.
Salt may also be placed to the left of the altar as representative of Earth. Salt can also be places on the right side of the alter when you want to represent the God (salt) and the Goddess (water).