No one drinks from the toilet — at least no one I’ve ever met! The only times I recall witnessing slurping from a toilet-bowl has been by man’s best friend — a dog. The single largest use of potable water in our homes is the toilet and it makes perfect sense to focus on water conservation first where we waste it the most.
If an average family of four replaced their 3.5-gpf. toilet(s) with 1.28-gpf. toilet(s), they would conserve, on average 21,134 gallons