If you are going to try it again so soon (one week later?!), I would also suggest at least one 10-minute stretching session off the bike to also use the restroom and cram a cliff/energy bar down your throat (solid food at the middle of a century keeps my stomach settled).
Keep it simple with the food and drink too. Don't try anything new that may upset your stomach during exertion, but try to evenly space it out over the entire ride. I shoot for about 150-200 calories per hour, mostly in the form of diluted sports drinks. I burn a lot more energy than that during an hour, but if I consume any more than that my stomach becomes upset. Experience has shown me that this approach really extends how long I have before I bonk. It adds about 15-20 minutes per hour that I make sure to eat and drink that way.
Have fun!