I have to ask: Why? Why do you want to do this marathon in two weeks?
I'm not saying you can't. I won't even say that you shouldn't (though I might think it). But it is important to understand the context. Why?
See, you are putting your health at risk here. It might be a fair risk... depending on the answer to the question. Or not.
Most folks will run for 6 months to two years before BEGINNING a marathon-specific training plan that lasts anywhere from 12 to 24 weeks (aka, six months).
Perhaps that will help you understand why people are responding to your 'two weeks' question the way they are.
Based on what you've posted, you don't have the base to do this. Best case is that you are going to be slow. Average case is that you'll be slow and miserable. Worst case is that you'll hurt yourself in a way that you stay hurt for awhile. (shrug) Only you can find out... and the only you can find out for sure 100% is by trying. Not sure I recommend it. Depends on the answer to 'why?'
BTW, one thing that I do know... you are asking some really basic questions about nutrition. Unfortunately, the answers are different for everyone. We find our own answers through experimentation during training. The trouble is, you are trying to do this race with no training. Yes, that's right. Two weeks is essentially "no training". There's no answer for you.
A primary guideline is 'don't experiment on race day'. So, you have a couple weeks to try different foods while running. Use that time wisely to figure out what works w/o making you sick.
You definitely need to figure this out. Without any type of training, your body probably doesn't have enough energy stores to complete 26.2 without A LOT of augmentation along the way. You don't want to be vomitting or spending time in the porta potty. And for me, if I eat anything more solid than gu, that's exactly what I'd be doing. But other people can stomach regular food during a race.
Good luck. Answer the "why" question for yourself. Know that you are doing something quite risky. Not something that people are going to recommend.
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