Zip's Nuka Fix

 refers to an unmarked and repeatable quest in Fallout 3.

Zip in Little Lamplight will trade various items for Nuka-Cola to satisfy his Nuka-Cola addiction.

Rewards
The reward received depends on the player's Barter skill and an added in random factor. The following table lists chances of getting every possible reward.

Bugs

 * It is possible that sometimes he does not want Nuka-Cola from you and instead says something bad or good about you regarding to your karma. Try talking to him a few more times and he will eventually say something about Nuka-Cola, then you can activate this quest by speaking to him about it. This may not be a bug, seems like a random speech event too.