I have read that distilled water doesn't conduct electricity. This, in other words, means that we can submerge electronic devices like PCs/laptops in it and run them without any problem. I haven't seen much information about this on the internet, but it should be possible.
So, can you really run a PC in distilled water? I don't know if you can, but I think if you could, it would start rusting/corroding in a few days. 😉