I've been there. Not really with the water thing, but I thought I was being watched, and that my GF was working for the CIA, my workplace was a front, and everyone working there was faking it, for the purposes of monitoring me, etc. That shit is scary! I was aware on some level that I wasn't being rational, but man, your own brain can be sooo convincing. I had that stupid fucking Nirvana line running through my head the whole time "just because you're paranoid, don't mean they're not after you." It's never really gone away, but I've found ways of managing it for myself, but live in constant fear if it getting bad again. So when I say this, you can trust it: I really do understand, and I sincerely hope you figure it out. All the best mate