
That's where this bottle cap clip concept by Matthias Ries comes in.
It couldn't be simpler--just screw it on to your Poland Spring bottle (assuming there is something resembling a universal standard for bottle cap size and threading, I suppose), and clip it on your bike. When you're done drinking, the clip goes back into your pocket or wherever you might want to store it. No screw-on cage in sight. I like it.
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I wonder if the same idea could be used on a squirt top too. Have a screw on top with a clip and a squirt nozzle.
And how do you drink with it? Unscrew The cap?