I have a 13' and typically do not use water hook up.  Due to my general camping radius, I often fill the fresh water tank with hard water.  This is leading to calcified water lines.  Does anyone have any tips to help prevent line blockage (the fix is expensive!)?  I was thinking of getting a portable water softener but since I need to fill my tank at a communal water spot, I'm concerned about the feasibility of such an endeavor.  I'm open to any recommendations you all might have!