[Rich]

If you are good with your hands and not too worried about working with gasoline around a boat, I can tell you how to get rid of the water in it yourself.

I had to deal with this 2 years ago and developed a pretty good method to do it myself.

You will also need to find out how the water got in your tank after it was previously emptied so to ensure that it doesn't happen again. This took me a while on my boat, but I think I finally found out how it was happening, and I believe I solved the root cause of the problem.

My method is not really 'fuel polishing' (I think this term is mostly for diesel fuel) but if it's relatively fresh gasoline, it will get rid of the water.

55 Gallons sounds like an internal tank, vs a portable tank, but it's doable. I had to pump out and clean 55 gallons myself. In the end, I removed about 2.5 gallons of water. I was able to do this without throwing out 55 gallons of gasoline (this was huge for me at the price of fuel was about $4 a gallon at the time).

Let me know if you would like the procedure, or if you prefer to find someone to pay to do it (I don't have connections for someone else as I did it myself).