[klausa]

To support you more, from [1]:

"Contrary to popular belief, caffeine does not act as a diuretic when consumed in moderation (less than five cups a day or 500 to 600 milligrams), and does not lead to dehydration or to a water-electrolyte imbalance; current evidence suggests that caffeinated beverages contribute to the body's daily fluid requirements no differently from pure water."

This particular misconception is kind of a pet peeve of mine, and it drives me nuts how widespread it is.

[1]: http://en.wikipedia.org/wiki/Health_effects_of_coffee#Laxati...