Sentence:  He sat for a while with his hands on his knees , watching the bend of her back as she gathered up her things - a comb , a <WSD>bottle</WSD> of aspirin - to take upstairs and pack . 
Meaning of the word marked with <WSD> tags:  a glass or plastic vessel used for storing drinks or other liquids; typically cylindrical without handles and with a narrow neck that can be plugged or capped