Fill the cauldron half-full of water and drop a silver coin into it. Position the cauldron so that the light of the Moon shines into the water. Gently sweep your hands just above the surface, symbolically gathering the Moon's silver.
While doing this, say:
Lovely Lady of the Moon, bring to me your wealth right soon. Fill my hands with silver and gold. All you give, my hands can hold.
Repeat three times. When finished, pour the water upon the Earth. This is best done during the Full Moon.