Edit
Fernet con coca (meaning "Fernet with Coke" in Spanish) is a long drink of Argentine origin consisting of the Italian amaro liqueur fernet and cola, served over ice. Although typically made with Fernet-Branca and Coca-Cola.
It is now considered a cultural icon of Argentina and is especially associated with its home province of Córdoba, where the drink is most consumed. The popularity of fernet con coca is such that Argentina consumes more than 75% of all fernet produced globally.
Walkers commonly make a "viajero" (meaning "traveller" in Spanish), using half-cut plastic bottles of Coca-Cola as containers for communal drinking and to carry the cocktail.
1