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Unless you run the water continually for 20 minutes, a shower uses less water than a bath, even if the bath isn’t entirely full - https://alumni.stanford.edu/get/page/magazine/article/?article_id=28853

So shower when you can, and turn the water off while you soap up!

Catch water from your shower/bath and use it to flush the toilet!

"More than 45% of water use in the average American home occurs in the bathroom, with nearly 27% being used by toilets." - http://www.conserveh2o.org/toilet-water-use

This is where I want to live: the intersection of luxury and conservation: DIY showerloop: http://m.instructables.com/id/Showerloop/

Water conservation isn't the main topic of this article - Small housing is, but water conservation in the home has its own section - Cultural Quandaries: Home Design
http://www.patheos.com/blogs/pathsthroughtheforests/2014/09/11/cultural-quandaries-home-design/