This could work similarly to the current sports premium stamps that do appear in different countries from time to time, with stamps of drinks from the whole world appearing at specific stores occasionally. Some examples I can think of:
  • Fernet ; An amaro, bitter, aromatic and strong spirit. Mostly consumed in Argentina and Italy
  • Pisco ; An special kind of brandy consumed in Chile and Peru
  • Rakija or Rakia ; Traditional fruit spirits or brandys from the balkans.
  • Caña ; A rum-ish spiced drink traditionally consumed in a great part of south america, particularly Paraguay and Argentina
  • Orujo ; Spaniard pomace brandy (the liquor obtained from the distillation of marc, the solid remains left after pressing of the grape)
  • Absinthe ; anise-flavoured spirit derived from several plants. Originally from Switzerland but very popular worldwide. Known for it's heavy alcohol %
And so on. Suggestions about local drinks of your countries are appreciated in the comments!