I recently stumbled upon greywater reuse twice:
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Apparently companies that offer recycling showers also offer greywater reuse
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In an old technical document from the JRC (p. 19)
For clarity: greywater is the wastewater that comes out of the sink, shower, bathtub and washing machine (so everything except the toilet).
It intrigues me because this is one of the few features that they have in Schoonship but not us. It also interests me, because a quick back-of-the-envelope calculation might point out that in a period of extreme drought, we might not have enough rainwater in stock to guarantee flushing the toilets.
So if anybody would feel inspired, I think it could be worth looking into whether it would be meaningful to provide for the right piping - i.e. separate collection and the possibility for supplying the toilets - without necessarily already investing in the reuse technology itself (= filtering and pumping).
As a small side note for our own records: I know one of the authors of the report linked above, so just in case it might be interesting one day I could ask whether he would be open for a short chat with one of us.