I got the Camelbak... but for a long ride I like to have Gatorade in the ol' bottle. It took a while to learn and I still don't like to do it if people are close, 'cause we had a nasty spill one year 'cause somebody dropped a bottle and then people braked and the group went down. (So if somebody drops their bottle in a group, just keep on riding - it will usually scoot out of the way even if you hit it.)
I just got a new camelbak from ebay for $20 ... Hi-Viz... I look like a rolling School Patrol Wannabee.... but you can SEE ME!