Urinals use anywhere from 10 to 14 ounces, and some are actually waterless
Some trough urinals use little to no water at all
Do your part, men. If you can't afford to install a urinal at home, whenever you can, go piss outside.
We've also been blessed with the ability to aim. So, if pissing outside isn't possible, use a sink (but please don't run the water the entire time like this schmuck)
somewhere where you can control the amount of water used to rinse.
At the very least, use a bucket or other container that can be emptied outside.
Ladies, you can do your part by making the above suggestions, and by not commenting if the males in your life are using either of the unorthodox methods above to conserve such a precious resource - unless, of course, it is to encourage them to do so.
Have a great weekend finding ways you can conserve water.