Tap water. As for a bottled version, tap-water with a metal bottle.
It's a bit of a snarky answer, but it's the truth. Literally all bottled-water companies are shady. I could be wrong, but I highly doubt it.
The only reasonable reason one might get bottled-water is for the bottle/container that it comes with; though flavor is a possible reason, though one can personally flavor their own water. Add the ri~ght amount of grit, you'll get something similar to most bottled-water products.