I'm half way in to
@Don S/V ILLusion's camp. I do use an RV filter, which is mostly carbon at the output end and our drinking water is filtered through a Brita filter which does take out a few more bad things.
I always flush the hose before adding water, by letting it run for a minute or so. Longer if the hose bib is far away from the water main or hasn't been used much by folks along the dock. The water tank is always shocked each spring and periodically the tanks are power washed.
Municipal water supplies are pretty safe. If you're getting your water from a well or other unknown source, then more care is needed.
So, to specifically answer your question I wouldn't worry about it too much. Just flush the hose well before used and drain it before putting it away. We used to use one of those white RV potable water hoses now we changed and use a hose that flattens, it takes up less room in the locker and is easier to drag around.