The way my kids waste water this is pretty ingenious and so simple
Biggest wasters of water round my way are private schools using obscene quantities of water on their Rugby fields
Hampshire and IOW yesterday announced there be a hosepipe ban from 5th August
https://www.dailyecho.co.uk/news/20585757.hampshire-isle-wight-hit-hosepipe-ban-drought-looms/
Sussex next?