You need water to make Water.....

Boss: OK, I have done away with those bottles of water and installed this new one.
Me: Er, OK
Boss: And I encourage you all to drink as much as you can.
Me: Er, OK. Its a water filter, right?
Boss: Yes and not only that, for every cup you drink, it uses three cups to clean itself.
Me: What! I don't believe.
Boss: Trust me. I know
So, a few months later, after I remembered about this, I decided to test the theory. And so, I poured myself a cup of water.
And rushed over to the other side where I have a container ready. Sure enough, after a few seconds, the "waste" water came out. And it was MORE than three cups! Luckily, we use the water to keep the plants alive, rinse out wee-wee, and chocolates.....