The favorite drink of Slovaks is Kofola, a non-alcoholic carbonated cola drink produced in Slovakia and the Czech Republic.

An excerpt from the article 37 facts about Slovakia

It was created in 1960 in Czechoslovakia, where it gained the greatest popularity. Kofola is the main competitor of Coca-Cola and Pepsi in the Czech Republic and Slovakia. The main ingredient of the drink is Kofo syrup, consisting of 14 herbal and fruit ingredients, water, sugar, caffeine, and caramel. Compared to Pepsi or Coca-Cola, it contains 30% less sugar, more caffeine, and no phosphates. It is popular in restaurants, where it can be poured straight from the barrel, just like beer.