Christianity: water that has been blessed by a priest. Used for

• Baptism
• Blessings of people, places, or things
• To dispel or protect from evil.

Magick: water used for blessings, banishing, purification, etc. Often combined with salt to represent the union of water and earth. May be blessed by leader of ritual or (among Pagans) by High Priest or High Priestess. My be replaced by wine or fruit juice.