Orange is the main flavor of both soft drinks, Solo from Slovenia, and the drink advertised with Krupa (song).
Sunkist is a brand of primarily orange flavored soft drinks launched in 1979. 
Solo is an orange-flavoured soft drink, owned by the Norwegian companies Ringnes, Oskar Sylte, Aass, and Mack. 
 The cover credits it as appearing in an advert for Sunkist. 
