I don't like to eat much solid stuff during long rides like that where I have to keep my energy focused (ie, no 15 minute breaks off the bike). So I would also opt for easy to eat energy bars (maybe cut them in smaller pieces and put them in a small ziploc bag so you can eat pieces and not have to down the whole thing). And then maybe a 1-2 of gels if you just don't want any bar stuff. I'd suggest for your drinks at least 1 bottle with sports drink (cytomax, gatorade, any electrolyte replacement type, etc.) and the rest water (or whatever you typically drink)...if I were you I'd plan on bring 4 bottles total. Drop some ice cubes in them so they stay at least a little cooler (I like my drinks a little cooler if possible!). Don't think you'll eat all the food, but it's good to have a gel alternative when solid food looks unappealing. And towels to wipe up all that sweat!!

And lastly, make sure you have equipped your freezer w/your favorite ice cream so you can celebrate your accomplishment with a little treat later, you earned it