This Sink Twice ($99) gadget installs in 5 minutes and converts your toilet lid into a sink. The idea is that you shouldn’t be using clean water to flush your toilets as the water is just going down the drain. Makes sense, I guess.
SinkTwice fits on your toilet lid, turning it into a touch-free sink that reuses the “gray water” from washing your hands. The soapy, used water drains directly into the bowl, saving up to two gallons of water per person, per day.
Why waste clean water to fill up your toilet when it will just be flushed away?