I think there's an elusive middle ground here that no one has hit upon- it's mostly the "always drink tank water crowd" vs. the "never drink tank water crowd"
So here's some additional thoughts:
...if the water in the tank is two months old, I'm probably not going to drink it.
But if we are really camping and using the water tank, the water is only going to last three to five days- so it won't get too stale.
Also, if you absolutely refuse to ever drink tank water ever at all whatsoever...perhaps you are a germophobe.
Conversely, if you find bottled water conveinient and like it's taste versus any number of other sources, that does not neccesarily make you a germophobe.