Need to stock up on food and supplies for a backyard barbecue? Head to Costco and add the following Kirkland Signature items ...

A box of four, one-pound packages of Kirkland butter costs about $17.40 ... Experts say other variables, including butter's water content, could be at play in the Costco butter debate.

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).