Joined: Jul 2002
Posts: 40,863
Likes: 3,115
From: Sacramento, California, USA
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
It depends on a lot of things. During the winter, I could go 50 on a single bottle. But during the summer, I'd probably drink at least 1 and a half over 30 miles. I usually have one of water and one of sports drink and I try to alternate sips.
You should definitely get a second cage, but unless you have a super OCP machine, I wouldn't spend more than $10 on it.