I use a drink mix from Infinit Nutrition. It’s a little pricey at $2-3 per bottle but one bottle an hour has everything I need - carbs (both simple and complex), sodium, protein, and caffeine. You can get one of their pre-made formulas or talk to a consultant for free to build a custom blend. I did my first Fondo / century using only the mix, and just had to carry powder and get water at the aid stations, with no issues.
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