Mostly just water. If it is summer or I'm doing a long ride I'll put what ever powdered isotonic drink is available at the supermarket. I'll occassionaly make my own concoction of molasses, salt and brown sugar. I need to experiment more to get the ratios right: sometimes it is too sweet, sometimes too salty.
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Get a bicycle. You will not regret it if you live. ~Mark Twain, "Taming the Bicycle"
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