Ok...I've got two young boys so potty humor is at an all-time high in our house.
Truth be told, though, when it's just the four of us at home we definitely try to conserve water by making multiple uses of the water in the bowl - as long as it's yellow - before flushing it down.
It started as an overnight noise curtesy, but we don't have the most modern water-efficient fixtures and really can't afford to replace what we've got at the moment, so it has evolved into a water conservation habit.
And besides, even if we had the 1.5 gallon per flush fixtures, why waste 1.5 gallons when all four of us need to go at the same time
BUT, with the kids being little, getting it across to them, that when we've got company the multi-use rule is NOT in effect, is sometimes problematic.
Also, since implementing the multi-use rule, I've come up with some additional corollaries about single use flushing:
* If you use an upstairs bathroom and no one else is immediately using it, FLUSH.
* If you use the downstairs bathroom and we're leaving the house, FLUSH.
Because, letting it mellow all day long is just too yukkie for words and means more frequent cleaning will be needed.
Along with intentional flush frequency reduction, I have collected a number of links which use grey water or rain water for feeding a toilet. Some are quite ingenius! Enjoy!
Rain Barrel to Toilet Installation - a practical how-to guide
I really want to do this someday!
Grey Water Recycling systems for the Bathroom
Sink-Toilet Combination fixtures
Here is a system available for collecting grey water from the kitchen sink.
There are also systems available for washing machine and shower water...just google Greywater System or Greywater Recycling.