I don't have a specific ...

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I don't have a specific study reference, but some keywords to look for are low-volume shower head retrofits (and new ones), low-volume toilets in use, usage of on-demand inline water heaters instead of tanks, "garden" farmers using drip irrigation or hydroponics, shift to all-shower (no bathtub) usage.  Other behavioural things to look for are the number of "baths/showers" taken, and why. 

You might look around at this site too: https://www.researchgate.net/