A Hechsher for Water:

The O-U has just put their kashruthy seal of approval on distilled water. Not plain water, not water that has additives that actually require kosher supervision; water that is distilled. Well, the product does contain electrolytes (these should be inorganic minerals), so perhaps formal supervision is required:

MD Drinks, Inc.

Redondo Beach, CA

Brand: Function Water

Product(s): Vapor Distilled Water and Electrolytes, OU