I wouldn't worry about riding all or part of it alone. There will be plenty of other riders to hook up with or, if you're like me, you'll enjoy at least a few miles of solitude.
I tend to need food every 20 miles or so. For longer rides, I use a top tube bag and place some bite size chunks of food, e.g., Payday candybars, Shot Blocs, that I can nibble on between rest stops. At rest stops, I usually eat at least half of a banana and a cookie or two. My stomach isn't particularly fussy, but I don't like the consistency of gels. At lunch, I usually eat a PB&J sandwich and something salty like chips or trail mix.
If I were you, I'd try to eat a bit more "real" food along the way and not rely exclusively on gels. When my stomach is empty of solid food, it starts to bother me and make me feel even hungrier than I really am.
I try to drink a 2 to 1 ratio of water and Cytomax, although I never seem to drink enough. I try to take a sip of something every 5 minutes on long rides, but I get off track and never seem to drink enough. 
Finally, half the battle regarding nutrition and hydration for a long ride starts before you get on the bike. Make sure you are plenty hydrated in the days leading up to the ride. I like to drink a big thing of water right when I get up the morning of the ride. Yes, it means going to the bathroom more frequently, but I'd rather do that than get dehydrated. I don't do much "carb loading," but I do eat a balanced dinner and breakfast.
Good luck and have fun!
Last edited by indysteel; 10-15-2008 at 06:24 AM.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher