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Hydraulic ram pump driven RO system
Used to see articles in Mother Earth News about using "hydraulic Ram Pumps" to pump small amounts of water to a higher point using the momentum of a larger amount of water. Said pumps used no input power other than that produced by the passing water.
So, what do boats have lots of? Water moving up and down (waves). Use this motion to drive a piston to pressurize a smaller amount of water for an RO system to make fresh water.
A similar device is something I have seen advertised, a pump mounted so that the surging motion of a boat attached to a piling pumps the bilge of a boat. Ingenious but practical?