Luke says that soldiers mock Jesus while offering him sour wine. The drink can sound like a peculiar detail unless it is placed within ordinary Mediterranean food and drink.
The Greek term oxos refers to sour or vinegary wine, a cheap beverage rather than prestigious table wine.
Wine mixed with water was widely consumed in the Greco-Roman world, and sour wine or wine vinegar could serve as an inexpensive, refreshing drink associated especially with ordinary laborers and soldiers. The Gospel does not require the liquid to be understood as a special poison.
Other Gospel accounts connect drink at the cross with additional scriptural and narrative details, but Luke specifically places the soldiers' offer within their mockery of Jesus as king.
Recognizing the drink as commonplace removes an unnecessary exotic element from the scene. The soldiers offer Jesus something belonging to their ordinary world while ridiculing his royal claim.
The contrast is characteristic of the passion narrative: the one proclaimed King receives the treatment and provisions of a condemned man under Roman power.