I'm not approaching this in any way, I'm just pointing out what uses water. You claimed to not even use 30l in a day. I showed why you probably use way more than that. Instead of acknowledging "huh, ya, ok maybe I can cut back a bit" you get all defensive and make excuses. This is why we are where we are.
And flushing can be helped at home, anyway. Unless every toilet visit is a dookie dropper, it's OK to leave it for a few rounds. As the city suggests in their information page.
https://www.calgary.ca/emergencies/f...ain-break.html