Why Does Coffee Make You Pee?

How diuretic is caffeine? Does your morning coffee make you pee more that a decaf would? What about green tea or cola? Scicurious has the answers in her latest Friday Weird Science.

Urine match heads

We discussed at lunch if you could survive, drinking your own urine. It was lunch so drinking other people's urine wasn't discussed as it seemed unappetizing.
In any case I can't really figure out how long you could repeatedly drink your own urine to stave off dehydration. However you could distill your urine. Of course, I wouldn't bother with digging a pit ect. like the link suggests when you could just do it on your stove.
In any case this reminded me that urine contains the element phosphorus, which has an interesting history. Check out a great synopsis on the history the discovery of phosphorus. Also there is an entire book out about phosphorus. Here is a review of The Shocking History of Phosphorus by John Emsley by the Naked Scientists.