Water-saving toilets can get you started on a greener lifestyle. It has been estimated that as much as 50 percent of the water which is used in one's home is flushed down the toilet. A traditional toilet uses about five gallons of water each time it is flushed, compared to a water-conserving toilet, which uses just 1.6 gallons. This is a 70% water savings. Don't stop using ceiling fans in the winter.