We don’t have an expiration date on our bottles — just a “Best By” date. To figure out the “Best By” date, find the letters “BB” one inch above or below the label (depending on where your bottle was made). Ice Mountain® Brand products have the following “Best By” dates: Sparkling 1.0L PET: 12 months from manufacturing date Sparkling 0.5L PET: 9 months from manufacturing date Still (non-carbonated): 18 months from manufacturing date.