Mount additional water bottle on bike frame with only one water bottle mount I only have one set of water bottle mount screws on my bike.  I would like to have an additional water bottle.  Ideally I would like to mount the bottle on the frame (preferably on the vertical tube).

Bonus: Can I order/build in Canada?
Get yourself two hose clamps that'll fit around the tube and some rubber strips to put under then so they don't scratch the paint up too badly. They'll hold a bottle cage on just fine. 

If you can see under the dirt and grime, that's exactly how the bottle cage in this picture is mounted: 



Edit: Here's another picture of a bottle cage mounted with hose clamps (not mine).