Shower with another person to save water

This one might have you wrinkling your noses. I know I'm showerishly selfish, and wouldn't want to share that space with someone else. But depending on your bathroom situation, doubling up on a shower or bath could be an efficient use of resources. Your shower buddy could be a relative, a friend, a partner, or even a pet. Mind you, if you use this time to engage in non-cleanliness-related activities, the energy savings will be lost.


Effort involved: no additional effort, just packing in an additional body.