In the case of Kirkland Signature's bottled water, the credit must go to none other than Niagara Bottling, LLC. Read more: The Surprising Way Costco Slices Up Its Pizza To Uniform Perfection ...

When it comes to Costco's Kirkland Signature purified drinking water, there is no added fluoride present. Per the product's nutrition label, the additives in the purified drinking water include ...