I've been plowing through 4-6 cups of green tea a day at work without drinking any water. Sure I piss like a race horse, but I'm doing it mostly so my body will more readily use fat as an energy source during cardio (I've been using a heart rate monitor to train for a half marathon in May, one of the key points was to keep your HR low enough to be using fat as an energy source instead of carbs so you can run long periods of time).
I quickly looked into whether or not tea dehydrates you before starting this green tea kick back in January and according to this article it doesn't: http://news.bbc.co.uk/2/hi/5281046.stm
However, a lot of my co-workers are still telling me that it does, and they point out that the study that I was using as gospel is actually funded by The Tea Council... fuck.
Anyone know of any scientific sources that has tested this? I searched Google and most of what I find is from Yahoo Answers with people spouting urban myths as answers.