Subject: Net water balance from cola -- diuretic efficiency

Caffeine is a diuretic, but caffeinated drinks contain lots of water.  If you
drink a Coke, is the extra urine produced more or less than the water consumed?  

One ought to be able to describe the effect of a caffeinated drink as a
percentage of pure water.  For example, if drinking 500 ml of Coke caused 250 ml
of extra urination, it's the same as if you had drunk only 250 ml of water, so
we'd say Coke's "effective water factor" would be 50%.  If that amount of Coke
instead caused 1000 ml of urination, its "effective water factor" would be -100%.

What is the "effective water factor" of cola?  How about coffee?  How about
other diuretic drinks, such as beer, wine, and liquor?

Re: Net water balance from cola -- diuretic efficiency