Join Date: Feb 2010
Location: Narragansett Bay
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No really good answer, this is one of the specific reasons that slips cost what they cost.
Here is a solution, but not cheap in year one. It pays off over time, I suppose. Install a watermaker to be sure you have plenty of freshwater. This is expensive, but has obvious other benefits too. If you don't already have a washdown pump, install this with a y-valve to a thru hull for salt water and to the water tank for fresh. Washdown pumps are not very expensive. Don't skimp on the washdown pump, get as much pressure as you can or you will feel like you are washing down with a squirt gun.
If you are willing to run in to top freshwater tanks often, you could skip the watermaker. Not sure about your neck of the woods, but continuously taking up space at the fuel dock just for water may not be welcomed. The other downside to a watermaker is they don't like contaminated water at all, and many harbors are contaminated.