Modern toilets come in a variety of styles, are easy to install and use very little water.
Shut off the water supply to the toilet by firmly closing the supply valve. Remove the tank lid, and flush the toilet, holding the lever down to let as much water drain from the tank as possible. Use a sponge to soak up the excess water in the tank and a plunger to force as much water as possible out of the bowl. Pop the caps from the base of the bowl. Remove the nuts with an open-ended wrench.