Coriolis Effect

I could look it up on wikipedia or simply google it but I'd like to ride from a few hundred miles north of the  Equator to see exactly where the toilet water switches from going one way around the bowl to the other. At the geographical center does it just fall straight down the sides of the bowl? Or, does it go one way in one house and the other way in another house next door? Hmm, I think I could get my head around my quest to shit way to the Equator and beyond! Sure, Google probably has the answer but I'd rather go on a quest. I think South America is the best choice for the search, but then perhaps I could try it on all three continents that are touched by the Equator. How sweet would that be, make a documentary on the subtleties of waste water processing across the developing world. I think I'm on to something here.