Mountain Dew, a brand of PepsiCo, Purchase, N.Y., tapped into its Southern roots and welcomed country music star Brantley Gilbert to the family. “I have been a fan of Mountain Dew for as long as I can remember,” Gilbert said in a statement. “I’m honored to be able to partner up with the Dew family for some exciting projects this year.” The brand partnered with Gilbert because he exemplifies what Mountain Dew stands for — not conforming to traditional molds and staying true to yourself — in the way that Gilbert performs country music true to its rebel roots, the company says.