So Building up a greater picture of how the van is being used we often find ourselves cutting a bottle in half and using it for waste water for brushing teeth or having to open up the door to throw water out from a cup you have just rinsed.
For me this still does not warrant having a full sink with fresh and waste water bottles taking up room. So inventive time comes a knocking with minimal space available and a brief of wanting to dispose of waste water here is the solution I have come up with.