Cirkul has built a devoted following by turning hydration into something customizable -- letting users control the intensity of their flavor with drop-in flavor packets and a simple dial that releases ...

Cirkul is a flavored water system that uses "sips" to enhance flavor with no sugar or calories. Today I offer my unbiased review of the bottle, lid, and 6 "sips," one from each category. I also rank ...

The brand makes inexpensive flavor cartridges that get inserted into a proprietary water bottle. Cirkul has tapped into the flavored-water craze while positioning itself as a sustainable option. Early ...