This item or feature has been removed from the game or replaced by something else.
The Whiskey Bottle (Half) was a item ingame that was generated when the whiskey bottle was half consumed. It was removed in Project Zomboid when a better system was introduced.
The coding was removed and now the consumption of Whiskey in game reduces via values.
The half bottle of whiskey is what you have left after taking one drink of a bottle of whiskey, after one more drink, the half bottle will turn into an empty bottle of whiskey. Drinking the half bottle will make your character drunk, and will act like a weaker version of painkillers, sleeping pills, and beta blockers.