Doing all this in one day? No opportunity to get stuff along the way?
If you can get water along the way, then just take powdered mix for your bottles if you put your carbs in them. Snacks and food for me would probably just be dried fruits and raisins. Maybe a few granola bars, power bars, or snickers bar.
While I've never done a ride that long in one day, I'd still think I could stuff all I need in my jersey and seat bag. Assuming of course I can get water along the way.
No one to volunteer to meet you in a SAG wagon at a point or two along the way?