Also remember to take into consideration more then nutrition on those long runs, depending on your skin tone and expected finish time - sunscreen could be an important addition - and man doing summer races I'll tell you not all those sweatproof sunscreens are sweatproof. Same thing goes for accessories, hat, sunglasses (the sun will be rising about 3 hours into the race, and you will certainly be seeing it on Osceola). I would 100% go buy yourself a stick of body glide - you'll figure out pretty quickly on your own where that needs to go. I wouldnt show up to the marathon in a set of brand new shoes, you're best bet is if you like the shoes your in, a few weeks beforehand go buy another set, break them in a little, then pack them up. I also strongly recommend a SpiBelt to bring some supplies - I usually have a thing of gelcubes and a couple sticks of gum - yes I know its probably not that safe to chew gum and run..