Editor’s note: This story has been updated. Deep in the heart of Coca-Cola territory in Georgia, PepsiCo is launching a new front in the cola wars — with the return of the Pepsi Challenge blind taste ...

Costco's switch from Pepsi back to Coca-Cola in its food courts is underway nationwide. Coca-Cola machines are popping up in stores this summer after CEO Ron Vachris announced the change in January.

There are few rivalries in business as fierce and long-lasting as that between Coca-Cola and Pepsi. For more than a century the pair have battled for dominance of the fizzy-drink business, with witty ...