(Reuters) - Diageo Plc (DGE.L), the world's biggest spirits maker, is in talks with the owners of Jose Cuervo tequila over extending a distribution deal or buying it outright for over $2 billion (1 billion pounds), sources familiar with the matter told Reuters. The London-based group distributes the world's best-selling tequila in most big export markets outside Mexico and is currently talking with the Beckmann family owners about what happens when this long-term contract ends in June 2013.