Quote Originally Posted by bikerchick68
move your left hand (assuming you're right handed, otherwise do it the other way!) as close to the center of the bars as you can.
Check out this thread. It suggests that you use the hand you use for your FRONT brake to grab your bottle. This allow you to use your rear brake in an emergency. I don't use water bottles. I use my camelback for both road and mountain biking... so what do I know. But there seems to be some merit in this method.