I think for the future of the toilet, we will have to revert to a composting toilet, because water will be limited if not gone altogether. The composting toilets will work on a place like Mars, where there it is known to be mostly all dry land. We can have multiple purposes for the poop we exude, including using it for soil in order to plant crops in order to survive. The movie “Martian” exemplifies this situation, although I do not know the exact scientific evidence behind it to know if it would actually work. We can also implement a bio digester in order to generate gas for cooking and electric. I think this would work, especially for a community that definitely doesn’t already have an installed toilet system. I also think smell can be a problem on Mars, because there aren’t a lot of natural resources already around to cover up the stench.

It’s extremely scary to think about a world without water, so as for the future of toilets on earth, if we can conserve water as much as possible, whether that is using a greywater system, a double flush option, or even composting, it can slow down the water scarcity problem.