If an inexpensive refit was widely available, would you do this in your home or business to conserve water?

bluewater asked: I’ve spent much of the last 3 years living on a sailboat. We can stay out for 6 weeks before refilling our 100-gallon water tank. Here in the US, each American averages 150 gallons every DAY. This is far and away more than any other country in the world.
On the boat, we [...]