Now I can understand the two liter bottle, after all, that has been the standard unit of American soda for years, but here in Italy (soon I will travel to other countries and see if this phenomenom extends past the Alps) the most common size bottle for anything is the 1.5 liter bottle. I've located Coke sold in 2 liter bottles (which are a different shape than the ones we have back home), but nothing asside from Milk (not useful since I don't have access to a fridge) and gasoline (non-potable in any form) have I found sold by the liter. Even water comes like this, six 1.5 liter bottles are sold for .79 EUR at the supermarket. If you can carry it back to school it's a deal.