I sanitize my tanks every spring, and even chlorinate water that gets put into the tanks (stops it from smelling later).
I will use my tank water for cooking, cleaning, bathing, toilet etc but we use bottled water for drinking/teeth. I guess my fear is not knowing the source of the water going INTO my tanks. but even at home we drink bottled water in 5 gallon jugs in a cooler.
now in my RV that used to set on a permanent lot, even though I delivered (chlorinated) water to it myself I still did not drink it. Plus it took too much water to sanitize the tanks every spring.