Don't like rucksacks as they make me too sweaty in summer. I come home with my back wet through. I figured someone would have found a wayseen some you can mount on the handle bars but i got a hydro pack under 20 quid, think it holds 2L
Looks like I should have done a bit of googling before I opened my mouth.
i thought it wasnt possible but all this just shows my lack of imagination.. Thankls..I use to be a handlebar mounted bottle type of guy but now favor my bottle between my legs using a plastic bottle cage mounted on top of the top frame tube it dosent bounce around off road like it did on the bars.
Using the type of cage in my link you can drill some 4mm holes through its side and cable tie it to your frame, a pice of rubber between the frame and cage helps keep things in place
http://www.ebay.co.uk/itm/Clarks-Polycarbonate-Lightweight-Water-Bottle-Cage-in-White-and-Black-With-Bolts-/141738353996?var=440855952278&hash=item210043a54c:m:maj7e3GTF6ncR4ldTS_RQ7w
You could use rivnuts to give you proper mounts in the frame, does mean setting about your frame with a drill though ... You don't need the expensive tools to fit them
I don't like using the same bottle over and over especially as I add electrolytes. Yes I know I can wash it out but I just can't be asked.Come to think of it in my previous electric days the water bottle soon ended up unusable