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The worst place to die of thirst must be the ocean. “Water, water, everywhere, and not a drop to drink,” says the old poem, and it’s an apt description of the situation. Stranded in a small boat, with not canteen of fresh water, you’re surrounded by miles and miles of water–but none of it does you any good. Ocean water isn’t fit for drinking. The salt in it dehydrates you, drying you...