wrong person mate it was salaman who was asking. I've done the quest a few times but on this playthrough i'm waiting until i've got 30 before going to see ms petrovita so i can finish it instantly.
For andyc and his nuka colas
Yes, there's a specific quest to gather a number of these for the challenge (and achievement....? Can't remember. Thats the only quest I can think of with them. Its obviously possible to drink them or use them in nuka-grenades and not have enough left for the collection quest. I made some nuka grenades out of mine after doing the collecting. They don't half explode and I insta-killed a few troublesome giant ants too