Summary List PlacementA startup that's challenging the likes of Gatorade and BodyArmor has raised millions from celebrities including Aaron Rodgers, an NFL quarterback and Jeopardy guest host, and the tennis star Sloane Stephens. Hydrant, which makes powdered beverages with electrolytes and other ingredients meant to improve the body's water absorption, announced Wednesday that it raised $8.5 million, which brings the startup's total fundraising amount to $17 million. Rx3 Growth Partners led the round, which also included the former 'N Sync singer Lance Bass and the actress Ashley Greene as investors.