I have always drunk from my fresh water tank.
When I first get an RV, I sanitize the tank using chlorine granules for a swimming pool/hottub. It doesn't need to be rinsed out to get rid of the bad bleach taste (which is added to bleach to stop kids from drinking it, so it is purposely made to taste horrid). Any chlorine residue is minimal and no worse than other chlorinated drinking water.
Then I always fill the tank at home from my municipal water (from which at least one bottled water company buys their water to bottle). It is chlorinated so no need to worry about re-sanitizing the tanks under normal circumstances. If the water starts tasting musty, etc, I would re-sanitize it, but that hasn't happened as yet.
Of course, I also drink from my tap. And yes, I have drunk from my garden hoses too. And swallowed pool water.