Photo: BonNontawat (Shutterstock)
If you really want to go the extra mile, you can use a bucket in the shower to wash up rather than letting the water run over you. During a drought in San Francisco, I stayed with friends who used a bucket in the shower to collect water as they waited for the shower to warm up. You can then pour that collected water down the toilet to activate the flushing mechanism, rather than constantly flushing the toilet, saving water two ways with one action.
Admittedly, it isn’t the most convenient—but losing some conveniences to continue to have drinking water doesn’t sound all that bad.