Sunshine,
One caveat on that book, her eating plan for a century ride is if you stop and picnic at lunch not hammer!

For good on-bike nutrition, I rely on Hammer Nutrition's Success for Endurance Athletes booklet. It talks nutrition, hydration on the bike. Though you never mentioned that as an issue, it may be helpful for you anyway.

Good luck on your ride. Ensure you taper down and eat well in preparation. Especially eat something nourishing 2 or 3 hours before hand!

best wishes,
Laura