It appears that the fuel is solid, not water but the solid fuel is water based. I know it says water on the CiHT but here is another video titled, Plasma Video which doesn't really show anything.
According to a post I read on Next Big Thing, Mills is only going to demo an instantaneous generations of watts. Unfortunately, a single reaction doesn't really prove or disprove anything although I can't find a corroborating link from BLP so the poster on NBT could be wrong.
BLP Discussion on Next Big Thing
Does anyone live near BLP in Jersey? If so, you should try to attend the demo on the 28th. I would go if I lived near it.
OK, I’m an idiot, it is Next Big Future, not next big thing. The links are goo though.
Harry Blackstone, et al are at least admitting they're doing it for entertainment. And their tricks are a lot more clever.