Best hydration set-up for IM Hawaii?

Hey guys and gals-

sorry if this has already been covered, but wondering what the experts out there think is the best aerodynamic set-up for water bottles for a course like Kona- I have a standard geometry bike ( not a beam bike, etc.)

I seem to remember reading a recent article on how the standard bottle set-up ( cages on seat and down tubes) actually turned out to be more aero than the behind-the seat set-up.

thanks for the advice in advance- trying to nail down the ol’ bike set-up!