Re: newbe question about freshwater tanks
For $800 you can low ball someone and get a fair-condition, ready to sail 22-25' sailboat that has a better reputation and doesn't look so weird.
To each their own, though. Good luck - I'd keep the water tank if you get the boat, it doesn't hurt anything being there and empty, and people like to wash their hands with fresh(ish) water more than lake water.
1985 Catalina 30 Std Rig "A Cenoura"