Ultras are all about managing inputs and outputs. Stomach has to absorb as much as it can to minimize the loss of nutrients; kidneys must continue their filtering job; energy output has to minimize muscle fatigue - legs and heart.
For me, Succeed caps (340mg of sodium) don't work; Endurolytes (40mg) do. Yet 100-mile race finishers consume 700mg of sodium per hour. I can't absorb that much sodium that fast today. I take 4 Endurolytes per hour and end up with a salt-crusted face.
Water without additives is essential to a good race; all the power drinks quickly get sickening if not washed out with water. My power drink is Perpetuem - 1 scoop/20 ounces of water/hour. Plus .75 quarts of water per hour.
Bread squares supply 90 calories each, but as the running goes on the ability to produce enough saliva to breakdown starches into sugars is compromised.
Along the way, a few Vitamin Cs, Es, ibuprofens, and Tums might come in handy.
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