I wanted to post a follow-up report on the effectiveness of the Sport drink recipe after having used it on the playa this year.
I mixed up a batch of the recipe and divided it up into separate containers for dissolving into a 1 quart Nalgene bottle of water. At BM, I alternated drinking 1 quart of the mix and 1 quart of plain water. This system seemed to work out my hydration needs very well throughout the week.
I experienced no headaches, muscle pains, cramps, dizziness or any other symptoms normally associated with dehydration. By my experience, I would not hesitate in using this recipe for any hydration situations in the future.