I noticed there are lots of USB powered pumps from China, eg(they are in Chinese but the video shows how it works)
USB酒缸抽酒器電動抽酒器5v抽酒神器自吸打酒器抽水泵家用灌裝機
臺式桶裝水抽水器電動礦泉水上水器家用飲水機大桶桌面自動吸水器
They are really cheap and seems to be convenient, I wonder if they will work for wine transferring and/bottling?