Arey, that dried raisin in water will swell up and become juicy again — that’s a hypotonic situation where water rushes *into* it. You see, when I mix my electrolyte drinks after a long day at the shop, if I add too little salt, it's hypotonic and my cells might soak up too much water, just like that raisin. But for a proper rehydration, I need isotonic balance, like the ORS packets I keep, because a hypertonic drink with too much salt would actually pull water *out*. My own cramps taught me that the sweet spot is everything.
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