During a ride a couple years ago, I was in front of our group (1/2 dozen recumbents) took out my bottle and drank, reached down to put it back and missed the cage, yelled "bottle" as it hit the ground and watched my mirror as everyone scattered left and right, but my DH was at the back and didn't hear me, and hit the bottle square on. Dragged it a little ways then it went under his front wheel and took him down. Tore up his bodysoc, a little road rash on his knee, ankle and elbow, but he was fine. And I think he took great delight from telling anyone who asked about his road rash, that "my wife threw her water bottle at me and knocked me off my bike".
So just remember it's still easy to have problems with your water bottle even after years of practice. It's the only time I've dropped a bottle, but if DH sees me reaching for it, he still rides way left or right of me, or slows way down behind me and watches until I've put it back. And just smiles :D
Lots of good advice from everyone - just takes practice and you'll get the hang of it.
Edna

