newbe question about freshwater tanks
I will be purchasing a older sailboat very shortly. The owner and myself are still negotiating a price but all looks good. The plywood interior is rotten and will need to be replaced. Since this will be done I figured its a good time to upgrade plumbing and electrical as well. I'm confused on the fresh water tank. Why do I need it? This boat is 26 ft long. I live in illinois. It will never be on an ocean. I plan on sailing lake Michigan. Could I pull water from the lake with a screen then use a filter system to make water?