Snakey has made it nearly a year on distilled alone, and he's looking healthy!

With the exception of some added pollutants from the air, rainwater is basically distilled water that's nicely aerated. So, I consider misted distilled water to be roughly equivalent. I would say that the oxygen thing you mentioned dr. del seems to have little basis in the science and chemistry I've been taught. I could be convinced that tap (or spring) water might contain extra minerals the snake's body could use. However, I've seen a definate preference for freshly misted water in 3 of 4 of my reptiles which suggests to me that they like pure water over anything else.

I also have to agree that I'm somewhat suspicious of the electrolyte thing.