Dual/low flush toilets are now a fairly standard option in the porcelain goddess section of home improvement stores, but if you are a renter or unable to afford a replacement and want to conserve water without "letting it mellow" check out this simple solution.
It may sound a bit crazy, but all you need it a good sized rock and you're ready to roll! Well, a rock or similar object that will displace water in the tank. Just make sure it won't fall victim to erosion from being submerged in the water (no bricks allowed), and be very careful not to damage the tank or block the mechanisms. This rudimentary fix means less water is needed to fill the tank to capacity, which in turn means less water is used in the flush!
(Image: Mill Creek Authority)