Vending Machine (Fallout 3)

Nuka-Cola vending machines are large containers that dispense Nuka-Cola.

They appear in Fallout and Fallout 2 as a world object and in Fallout 3 as a container. It would also appear in Van Buren.

Fallout and Fallout 2
Nuka-Cola machines are commonly found throughout the wasteland, and in Fallout 2 they're usable. Just right click on the machine and use money into it. This will initiate a luck and a agility test which will see if:
 * Your character catches the bottle.
 * If you can't catch it, he/she will be able to dodge it with the bottle flying a few yards away. If you aren't able to catch it, the PC will get hit by the bottle in the groin area. (With the PC saying Uff! and a small HP loss)

Fallout 3
In Fallout 3, it works like a normal container with only Nuka-Cola, caps, and, occasionally, Nuka-Cola Quantum. There are 152 of them throughout the Capital Wasteland in Metro stations, homes and buildings.

Each machine will contain at least one Nuka-Cola and has a 10% chance of containing 1-9 bottle caps and a 10% chance of a Nuka-Cola Quantum. There are also two 75% chances for other Nuka-Colas, meaning that a fully-stocked machine will contain three Nuka-Colas, nine bottle caps, and a Quantum.

These randomize at a per-game basis, and seem to be safe for storage since they remain empty the rest of the game after having been looted. (tested PS3)

You can buy a pristine Nuka-Cola machine for your house in Megaton (see Moira Brown), or suite in Tenpenny Tower (see Lydia Montenegro). Putting Nuka-Colas into your personal vending machine will turn them into ice cold Nuka-Cola which heals you more with less radiation (+20HP/+1RAD vs. +10HP/+2RAD).

Van Buren
It would also appear in the canceled Van Buren, but whether it would have been usable to the player is unknown.