For road I like cages and stainless steel Theromeses to keep water really cold on very hot days during long rides. A handlebar mounted cage and 500ml bottle let's me have water near to hand and i top up that bottle from the
termoses.
#04g Miele Uno L.S. Rebuilt 4 Touring - Thermoses Keep Water Cold on Very Hot Days by
Miele Man, on Flickr
Cheers