Finally got my TDS meter today, and tested some things.
My tap = 490. Ugh.
Tap after running through a "Brita Filter" on the faucet = 460. So - basically that filter is useless. But, it is one month old. So I'll put a new filter on and retest.
Bottle of "Purified Drinking Water" - 110.
And finally, the bulk water which I was so curious about in the first place
19! Wooohoo! It is safe indeed. Very good news!