McDonald's is moving into energy drinks, teaming with Red Bull as the fast-food giant expands its beverage lineup while working to drive more customers to its U.S. restaurants.Starting Aug. 17, participating McDonald's restaurants nationwide will sell the Red Bull Dragonberry Energizer, marking the company's entry into the energy drink category.The drink combines Red Bull with blue raspberry syrup and freeze-dried dragonfruit. Customers can substitute Red Bull Zero for a reduced-sugar version or purchase an 8.4-ounce can of Red Bull separately.The beverage expansion comes as McDonald's works t...