What if the glass isn't exactly half full?

[Feathered_IV]

My glass was half full, but some of the contents were incompatible with my glass, so they were taken away. Much of what I put into the glass dried up in the meantime. Later I was promised a tankard. However it's contents remain unknown and indeed can not be guaranteed until my present glass can function as well as other glasses.

The suppliers of the glass hope to turn it into a tankard for me, but as yet can not seem to get a handle on it.