They are spread all over the wasteland. Search for the "Super Pharmacy" room in the super duper mart and you will find some in there in a box (not metal, wooden). There is a nuka cola plant and there you will find the shipping data (not many quantums though) the shipping data are: 1.Superduper mart + 2.Paradise falls shopping mall 3.Old Olney mart (or somthing like that) there you got 3 places you can find some. w:c:fallout:Quantum#Bottle_locations