I’m learning from the comments. I’m thinking poo water is recycled more often where there is water scarcity. My current town detoxifies the poo water and releases it back into a nearby river instead of reusing it as drinking water. It’s not pure water, but some regulated blend that won’t upset the river ecosystem. Lots of bacteria and other processes involved.

In elementary, we had a field trip to the water treatment plant. It stunk… badly 🤢, but it was cool learning how it worked.

My mostly Hispanic hometown’s water was mixed with recycled poo water. It was heavily filtered and processed and was probably safe… But still.

It also had a chemical taste to it.

Edit: In the US

They exist for adults too, but I’ve only ever seen extreme versions at carnivals.