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...

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