Empty Vodka Bottle is an item in House Party. It is found in the Liquor Cabinet in the Dining Room.
The Empty Vodka Bottle contains no alcohol, but Frank will still attack you if you take it from the Liquor Cabinet. To get it, you must inspect the bottle to confirm it's empty, then ask Frank for permission to take it.
If you use the Empty Vodka Bottle with the Faucet in the Kitchen, it becomes the Bottle of Water. You can use this in Meltdown or Katherine's "D"-Mands.