This picture is actually a screenshot of a video, but here a boy, who does not have a running shower, needs to wash his hair. Equipped with just a bottle and a sink, he decides to fill a water bottle, strap it to his back and wash his hair by tipping forward over the sink and letting the water pour over his shampooed hair to wash it out.
With limited resources but needing to wash his hair, this is a very innovative concept that gets the job done!