Originally Posted by Judi

My husband usually attaches a couple water bottles to his bike with bungee cords, besides the one that fits in the bottle holder. He used to have a rear rack on his old bike and he'd put a little insulated lunch bag full of water bottles on it. It didn't fit on his new bike and he hasn't gotten around to getting another one, but I think the rack was about $20 at Walmart so it wouldn't be an expensive thing to try. You wouldn't want to overload the rack, because anything on it is adding weight to the rear axle, but even a gallon of water is only 8lbs, so using it to carry water should be fine.

Once you figure out a way to carry several water bottles, you might try freezing a couple of them before your ride. They'll thaw while you ride and you'll have cold water when you need it.