Typical, visitors show up with an empty esky.

There was a French doctor who cross Atlantic in a small rowing boat without having fresh water back in 1960s. He did some other experiments of this kind to work out methodology of sea survival in adverse conditions sort of like Australian "bush tucker man" except in more extreme conditions. I think his name was Allen Bompar. His conclusion was that people at sea die not from hunger or thirst but from fear of unknown. He drunk sea water.