I missed all the fun. For you math haters, the wine puzzle wasn't really meant to be a math puzzle. I figured it out just by sort of picturing it in my head. Now I grant you, I'm not sure that I could actually explain the "why" part that way, but I knew it was equal fairly quickly. My brother did it in his head the same way, without all the math. Now both our "instincts" wanted to get it wrong, but then we got it once we thought about it just a bit.
(And yes, evaporation and all that rot was just complicating the puzzle. It wasn't really a chemical experiment. Alty had the right idea of a better chemical experiment. :D)