Milk bottle

The milk bottle is a miscellaneous item found in Fallout 3 and Fallout: New Vegas.

Characteristics
They are of little value outside of use as Rock-It Launcher ammunition. Milk cannot be consumed in the game, as only empty bottles are ever found. Milk bottles can be found in numerous places in the Capital and Mojave Wasteland (particularly in houses) and certain merchants will sell them as well.

With the introduction of the Fallout: New Vegas add-on Old World Blues, milk bottles have finally been given a substantially useful purpose. They can be refilled at the Sink, creating Purified water.