This is a common fitting available at camping centers. You could mount this in the cockpit near the helm seat down low. I would want a shut off valve right there for when I leave the boat. I also would want a pressure gauge to drop the pressure if you think it would be needed.
When we are living aboard at the dock, we simply fill the tank with the dock hose. We use 15 gallons a day for two people, so once every 6 days we need water. No big deal.
I would not deal with this, I would let it be, and simply get use to managing water while living on the boat.
