Large whiskey bottle

The large whiskey bottle is a common item in Fallout 3 and Fallout: New Vegas.

Fallout 3
It's useful only as Rock-It Launcher ammunition. They can be found in every settlement and many ruins.

Fallout: New Vegas
The Honest Hearts add-on introduced a recipe for large wasteland tequila which requires this item, making it significantly more useful.

Old World Blues allows the player to refill this item at the Sink, creating Purified water.

Fallout: New Vegas
Large whiskey bottles can generally be found in areas with large amounts of Empty whiskey bottles, only in smaller numbers.
 * Two are found right next to the campfire near the Goodsprings Source fast-travel point.
 * The casino area of the Lucky 38 contains a full dozen on a set of shelves behind one of the counters.
 * Many can be found alongside several Empty whiskey bottles in the mining carts just outside of the NCR Correctional Facility main entrance.
 * Three can be found in Aerotech Suite 300, in the room with two safes stacked on top of one another at the Aerotech Office Park.