If you are worried about drinking safe water from your tanks, 5 methods for a boat...How should one treat incoming water with chlorine?
1) Boil some water for +1 minute (hopefully you are at sea level
2) Use a treatment chemical. (We have these in our "bug out" box)
3) Buy a Reverse Osmosis Water maker and forget shore water. ( no sulfides either
4) Buy bottled water and store aboard.
5) Follow @Maine Sail post#10 and to avoid what @Don S/V ILLusion suggests is by soaking the Carbon Filter in this cheap Hydrogen Peroxide overnight before sailing.
Jim...
PS: You would not be allowed to use Chlorine Gas pre-treatment in my marina.