fresh water tank

Most bottled water is just filtered municipal (tap) water. Use your own filter and save money and the environment.

Haven't bought any water in my 15 years of full time.
For drinking & cooking and the ice maker, all that water from the fresh water tank goes through a filter that takes out everything that may be bad.

You can use drink from your fresh water system if you sanitize it per recommended procedures.

You'll find a mixed crowd here.
Some do, some don't.
Some haul their water from home (there's a whole bunch of threads on that too...)
Others fill up when they get near or arrive at their destination.
I don't recall hearing anyone has died from drinking their on board water, just be sure you sanitize at least at the beginning of the season.
We generally use our on board water for everything but making coffee. We bring a couple of gallons from home for that task. I can take bugs, rain, mud, and even yippy dogs and screaming kids while camping, but I gotta have coffee that tastes like at home.

We drink from our clean the tank every trip with bleach and have never had a problem other than the water gets warm, but we make coffee with it most of the time.

We installed an under-the-sink reverse osmosis unit for our fresh water. The RO "waste" water is plumbed so it goes back into the fresh water tank so there's no wasted water.

Have your will updated...I'm sure your gonna die of some type of water problem or that is how some people play it out to be.

We sanitize tank at least 2 a year.

But we do go places that has water that does not taste good, so we buy bottled water by the gallon in those places. I can usually tell with the first pot of coffee if water tastes bad or not.

I think you'll take more of a chance getting sick by eating in some tourist trap places.

We also have noticed that some places have some type of water that has a scale to it. Every spring we clean out hot water tank with a cheap Camping World nozzle things to rinse it out good also. Have also changed faucet aerators just to be safe with water pressure.

You drink water from plastic bottles.........

Just think of your fresh water tank as a BIG plastic bottle.

I am far from full time and always bring drinking water. If I were full time I would probably use the fresh water tank with some sort of filtering system. For now we just fill gallon jugs with our RO system from home. I do add a small amount of bleach to the fresh water tank a couple times a year. Just enough to make it safe to drink. That way when brushing teeth etc I am pretty certain it won't kill the whole family!!

We've always used the tank. cleaned it with bleach a time or two. Always put in water freshner/drinking water quality chlorine. We filter our water into the tank. eve if we didn't drink it I wouldn't want to bathe or cook with water with nasties in it.
Before we head out cleaning out/ flushing out the tank and lines and water heater is a priority.
Saves a ton, of money, over using bottled water, which is bottled in plastic and sometimes you can taste it. Storage space is always a premium and bottled water would take up quite a bit, if enough for a trip. Wife sometimes brings some on board, to take on day trips etc in towed. I would just as soon use stainless thermos or other type containers, if we could find them and use the on board supply in them.