Re: Fresh Water Repair/Replace ?
It would be helpful to know of what material the tank is constructed and the location of the leak, starters. FWIW, some people faced with this problem remove the top, only, of the tank and fit a bladder. We personally had lousy success with bladders (the worst one chafed through in 2 weeks!), and had s/s tanks made. So, in our use the bladders were problematical, but others have had good success with them.
Ann & Jim, U.S. s/v Insatiable II, SE Qld, for a while