A split. The smallest bottle size of champagne is called a Quarter holding 18.75cls.
Phial
Flacon
Usually it was held in a small glass bottle. Or sometimes there was a small compartment in the desk that you could put the glass bottle in and then it held the ink.
A scent bottle is a flacon, the root of the word is French
Um... beer?
Put them in the freezer overnight. The next day lower the large bottle in very warm water without allowing warm water to contact the small bottle. The overnight cold will contract the small bottle and the warmth will expand the large bottle. They may be easy to separate that way.
Star Tonight - 1955 A Small Glass Bottle 2-41 was released on: USA: 7 June 1956
I think you might be looking for cruet.
A phial (vial in the US) may be what you are after.
An ampoule is a small glass bottle or container containing a solution suitable for injection.
Grease the top of the bottle!
It is called a cruet.