Cirkul water bottles let you create your own beverage-drinking experience, but keeping the process germ-free can be a little more complicated than you'd expect.

Joined the Cirkul clique? Here's how to keep your Cirkul water bottle in sparkling clean, tip top shape so you can savor the flavor of daily hydration.

Garrett Waggoner and Andy Gay came up with their idea for flavored-water startup Cirkul as Dartmouth football teammates — and then made it a $1 billion company.

Garrett Waggoner and Andy Gay came up with their idea for flavored-water startup Cirkul as Dartmouth football teammates — and then made it a $1 billion company.

Cirkul Water is a beverage company that sells flavor cartridges that make water taste better without adding artificial flavors, colors, sugar, or calories.

Cirkul, which makes cartridges and bottles to add flavors to water, is exploring raising capital ahead of a future initial public offering, according to people with knowledge of the matter. The ...