https://www.thebrighterside.news/global-good/emission-free-hydrogen-generator-can-power-your-home-for-days-using-less-than-2-liters-of-water

Half of the water used to flush a toilet can power a home for days

Enapter says its electrolyser uses about 2.4 liters of water to generate enough hydrogen for a couple’s home for several days.

However, the exact number of days depends on the power storage capacity. This amount of water is equal to half of the water used for flushing a toilet once (5 liters), and eight times less than the water consumption of a dishwasher (20 liters).