Ancient Greeks believed in this technique called Moon Infused Water — drawing down the moon or the Thessalian Trick. They believed that the Thessalian witches had great powers and magical knowledge and this is how they would get their Moon Infused Water.
1. Fill a jar or dish to the brim with pure spring water
2. Bring this container inside and position it so that the full moon reflected in it. Keep doing this as long as possible.
3. The moon-changed water may now be used as a potent ingredient in potions and spells, substituted whenever a spell demands water.