One solution: source-separated toilets (think: a little bowl within a big bowl), already being tried in Sweden and Denmark.

一个解决办法：在源头上建造有单线管道的厕所。 丹麦和瑞典已经在试行这一方案了。

youdao

And it most certainly does not worry me that the solution to all having such a bowl is that some can have many bowls.

FORBES: Let's Eradicate Poverty And Darn The Inequality