Staying well hydrated can make the difference in everything from being alert to avoiding seasickness. You should never feel thirsty or your body is telling you something. (margarita thirsty is a whole different matter) I would consider a hand operated watermaker. I would still plan to carry enough, but that way you don't have to worry as much.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.