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>drink saltwater
>cry a lot
There is a theory/hypothesis that tears are designed to excrete excess salt from your body. The idea is you drink saltwater and cry out the salt.
There was a recent story I read about some kid who was lost at sea all alone for about a month. The one thing that stuck out was it said he cried often. I think that contributed to his survival, but then again it's an unconfirmed theory AFAIK