Typical drinks for Austria are variations of white wine with sparkling water. Hugo very originally comes from Italy but they already have their stamp in the series.

Otherwise Kaiserspritzer would be definitely Austrian.

The Kaiserspritzer is a traditional version of the Austrian "G'spritzten" (wine with mineral water). It is made with white wine, mineral water, and elderflower syrup, often complemented with mint and a slice of lemon.