I am with Dave on drinking the water from our tank. We sanitize the entire system every spring using Thetford's Freshwater Sanitizing system (I have aluminum water tank so don't want to use bleach). I filter the water going into the tank using a good quality water filter (mainly carbon) and use a Nature's Pure QC2 filter system at the galley sink for drinking. I leave the tank empty every winter. I am also fussy about the water source that goes into the tank. Our water is clear, good smelling, and tastes good. Use your water and change it often (don't let it sit).
Fuel additives are a debatable subject. Some insist that no additives are needed, and maybe even a bad thing. Personally, I use Startron Diesel additive and a biocide. These were given high reviews by Practical Sailor testing a few years ago. If you have older engines and are worried about the possible lack of lubrosity due to ultra low sulfer, you could add a small amount of ATF (1 quart per 200 gallons?) to increase the lubrication, but for most engines probably not needed.
Just buy your fuel from a busy, high volume trusted station, and keep water out of your tanks (change deck fill O rings, etc.).
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Tom
Nanaimo, BC
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