Originally Posted by AndrewP
A pressurised hydration system that mounts in the frame, but allows you to drink whithout taking your hands off the bars. Pressurised either by hand pump, or by lung power.
A standard CamelBak should be able to do this. Is there a reverse flow prevention valve? Otherwise simply blow air down the tube. It will bubble up through the fluid and inflate the bag above it, providing a pressurized fluid chamber and squirting the contents of the bag out the sip tube.
I don't have one though, so maybe there's something I'm missing.