I roll with a couple of 1.5 liter Nalgene bottles, utilizing two BBB XL Fueltanks
http://www.charliethebikemonger.com/...cage-560-p.asp
I removed the top clips and will eventually get around to buying a couple of pedal toe straps to use as bottle retainers.
They've shown no inclination to fall out yet, but most of my riding has been on tarmac.
The original top clip works great with a narrow mouth bottle like a 1.5 liter coke bottle.