You had better stop drinking altogether then, mate. Get this. I go for a swim in the sea and while I'm in there I have a clandestine, average-sized piss. Give it a year or two then scoop up a tumbler of water from the sea, anywhere in the world. There will be around one hundred molecules of my ex-piss in that tumbler. And there's six billion of us (and don't kid yourself that it doesn't all get nice and mixed up in the water cycle). You've had it, mate. It's everywhere. There's no escape, I tell you.