just because it's not unreasonable, let me offer some support for the idea of just carrying a bottle or two in the jersey pockets. I do it now and then.
To lend it a bit of authenticity, I've got a photo of a friend in the 1982 Iron Horse Classic bike race in Durango, CO where he rode the road stage with one bottle in the frame cage and two in his jersey pockets.
Steve in Peoria