Costco's Kirkland Signature purified bottled water does have a few additives in addition to pure H2O, and this is whether or not fluoride is among them.

If you see someone with Kirkland Signature branded items, you know their ideal place to shop. Costco's signature brand is massively popular among proud members of the exclusive store, as it's ...

Bottle of Kirkland's Old Fashioned next to a vintage radio - Jennifer Richmond/Static Media ...