Once in boot camp I folded up on a long run and was given a jug of Ringer's lactate to rehydrate with. Seemed to work pretty good.

An ER doctor friend of mine also said pedialyte is a pretty good rehydrating liquid. Hey, if it works for the kids, it should work for the rest of us.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)