Re: potable water systems
For daysails and overnights? Totally unnecessary. Buy a 5 gallon water carrier and just use that.
However, if you feel like restoring the system to service, Google Peggy Hall headmistress. Her articles are full of good info on this. It can be as simple as replacing the nasty hoses, cleaning the sink pumps and sloshing some bleach around inside the tank.
I have put my system back in service and I regularly cook and drink from the tank. No odors or funny tastes at all.
S/V Old Shoes
1973 Pearson 30 #255