NASA has just awarded a launch and a construction grant to Cornell University for a CubeSat designed to orbit the moon. Launch is scheduled for 2019. The core spacecraft technology involves a water electrolysis propulsion thruster which Cornell has been working on since 2009.

http://cornellsun.com/2017/06/22/nasa-to-send-cornell-groups-satellite-into-...

Makes me recall an article I read many years ago ...

J. King, "Using Water as a Primary Method of Propulsion for Spacecraft Modifying Standard STS Orbits," Orbit, no. 19, Nov/Dec 1984, pp 5-8.

This article is available at http://www.ka9q.net/AMSAT-ORBIT-19.pdf (Thank you Phil!)

Martin Davidoff, K2UBC