We use the dock water when along side and just turn the tap off when leaving the boat for any longer than a few hours.
I would suggest a Shurflow or similar inlet fitting with pressure reducing valve. We use a 60 psi one but you can get them at various pressures. From there just run a line to a T fitting in the pressure line from your pump. I would think you would have to make sure there is or place a non return valve somewhere in the supply line from the tank to prevent back flow.
We find it very convenient and just manage the risk as we live on board.
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