General Brazilian
refresco, petisco
Most common usage in Brazil; 'refresco' for beverages, 'petisco' for snacks
Rio de Janeiro
refresco, água com gás
Frequently refers to soft drinks and carbonated beverages
São Paulo
refresco, lanchinho
'Lanchinho' used informally for light snacks
Portugal
refresco, bebida refrescante
More formal usage; often refers to refreshing beverages