Lifesaving bottle / Lifesaving bottle

As a kind of containers,plastic bottles like mineral water bottles have a very short life time.People usually throw them away after finishing drinking,which is a waste of resource.What`s worse,they will cause pollution to the environment if not be recycled effectively.
I have got an idea on the problem by observing and studying a lot that I added a connector to the bottom of the bottles. The empty bottles can be connected as a life buoy.In this way,we can make empty bottles extend their life,thus helping to make the best of resource effectively and save it.
The design makes it possible to use empty bottles in diverse ways.