Welcome to the fold,although not intimately familiar with your model yes you can replace the water line from many stores just make sure it is made for drinking water. You will need to sanitize your fresh water tank. My faucet was a hand pump type with a diaphragm if all your lines are that gross I would just bite the bullet and replace. Good chance it would give you problems any way.
Now for the propane system check around for a used tray mount if not on line or RV supply. The tank and regulator RV supply, BBQ supply, etc. Check your system with compressed air before ever hooking up the propane tank.
You are on the right track fix one system at a time. Remember everything does not have to be perfect to go camping.
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Neil & Karol 2015 Seneca HJ
Dolly tow 2017 Cadillac XT5, Toads 2008 Chevy 1 ton DRW, 79 Jeep CJ5
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