Just be glad Maurten even exists. I use to do the WA protocol with E-Fuel at 2g carb / oz water (normal dilution for a normal carb drink). It was nearly 2.5 gallons of water in a single day and I was floating. I've got my suspicion that I might have been diluting out my electrolyte balance in exchange for those carbs. Maurten is a definite win for carbs/oz water consumed. Makes the protocol significantly easier.
I've been testing out both of their gels recently (with and without caffeine). It's 25g carb per package and the size of them is close to the same as Egel (which has 37g per packet). The major advantage of the Maurten gels is their hydrogel technology and they're advertised as not needing water to be absorbed. That's a huge win when consuming water in a race can be at a premium on occasion. The drawback is a limited source of electrolytes (only sodium). So I'm not sure it's a single source. So for me, I've been doing the following:
-Maurten 320 15 min prior to starting the run (or in training I'm using SIS Beta because it's cheaper)
-Swig of concentrated Tailwind (2oz and 1 scoop) at 45 min and 1:45
-Maurten Caffeine at 60 min
-Maurten regular at 120 min
-Egel at 1:15 and 2:15.
This will give me 93g carbs/hr. In two trials thus far, I've tolerated the protocol without issue. The gels are interesting because they're like Jell-o consistency. The caffeine is a noticeable boost at 100mg. I'm thinking it's a good balance.
Can you not but Maurten in Germany, or bring it with you when you travel to Marathon Weekend? I'm not sure of locations that sell Maurten in Orlando, but maybe some local people might have a better idea.
You can do all real food. Ideally, you find real foods that are super high in fast digesting carbs and limited in fat/protein. The ratios used in the paper based on my calcs was 90% carb, 7.5% protein, and 2.5% fat (although I don't remember if it was specifically spelled out that way). Otherwise, the calorie burden may become even higher than needed if you allow the % to shift too much. But the key thing to remember is that most of the research shows that it's the grams/kg bw of carbs consumed more so than the % of carbs in your diet that matters. I highly suggest trying it out (not really any different than trying any protocol) just to make sure everything sits right the next day.