Water, H2O, doesn't conduct electricity, you need ions to conduct electricity. Tap water is really a solution, it has lots of things in it. That's why you shouldn't use it in a car battery. Yes everybody knows the dangers of bathing with your appliances. But the man didn't say tap water or snow melt or sea saline. He said water and I'm not going to make assumptions. Also remember we're talking about lighting which is static electricity, static charges travel over the surface of insulators, or through gas that has enough ions or has collected enough polarized particles. And 3 inches of brand new steam has not.