What started as a conversation between two college football players became Cirkul, a billion-dollar company transforming the way Americans hydrate.

Cirkul, a Tampa, Florida-based company that sells customizable water bottles that infuse plain water with flavor cartridges, allows customers to control the intensity of their drink with the changing of a dial. The company offers more than 150 flavors, with some of the customer favorites last year including "Gateway Tea," "Frosted Refreshers" and "Inflow Energy," according to Cirkul's website.

Co-Founders Garrett Waggoner and Andy Gay, who met while playing football at Dartmouth College, told FOX Business that the idea for Cirkul was born out of frustration with trying to pour powdered sports drink mixes into disposable water bottles.

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