try distilled + unflavored food coloring... YUCK!
anyway, more seriously, what are you planning to cool? your CPU or graphics cards? both? and your budget would be nice to know as well, we can put together some nice stuff for ya if we know the budget, if you dont want to do that yourself that is... just look around a few other threads, a lot of information is just repeated infinately anyway, so most shouldnt be hard to find.