If y'all have been drinking RV water for so long, that might explain a few things...
Mine has a slight "musty old camper" smell and flavor to it, and early in the season it still has a tinge of RV antifreeze to it. Doesn't matter how many times I flush or sanitize or bleach the tank. I drink bottled water, but I also don't go away for weeks at a time, and where I go usually serves bottled water as a beverage choice, and it's a fundraiser so I don't mind spending a few extra dollars on bottled water or I'm working at the event and drink for free.