XLabs and PD both make a 'torpedo' style and then you have the PD arodrink, any the option of doing a frame mounted triangle shaped bottle with a long straw.
the goal being to maintain an aero position, which system do you like? what does one offer over the other?
I know that the PD drink system has a double reservoir so that you could have plain water in one and a mix in another.
Perhaps I didnt search deep enough in the thousands of threads but this is on the short list of near future purchases and curious on your input.