Storing clip for Pro Design Aero Bottle
Without being 100% sure as the picture isn't very informative, it looks like you need to make a fake bottle.  I'd use a long strip of corrguated card cut to approximately the length of the bottle and rolled to the right diameter (you don't have to do this all with one piece).  You could start with a core from something like a roll of paper towel, and wrap the card round that.