Costco's Kirkland Signature purified bottled water does have a few additives in addition to pure H2O, and this is whether or ...

As a private-label brand, Kirkland products are outsourced to other producers, often massively popular name brands — Keurig makes Kirkland ... flavored with seltzer water and other ingredients ...

Kirkland's Signature Spiced Rum comes from Sazerac Co. and Tennessee Distillation makes Costco's London Dry ... is best enjoyed with just a touch of water rather than straight.

A measure of how effectively the filter removed flavor taints, along with the resulting odor taints, that CR added to plain water with minimal intrinsic flavor and odor (the "control" water).

This makes Costco's product similar to alkaline ... What we know for sure is that all of the Kirkland water's additives are colorless, odorless, and perfectly safe to consume.