[rainedin]

I guess if you have your liquid waste contained within closed loop then you can get around drought issues.

Making black water potable I'd guess uses more energy and resources than recycling grey. I bet a victorian sewage system couldn't work without gallons of water either. An alternative might be to defacate in our gardens if we have them.

Piss by itself isn't that harmful, you can use it on the garden. I piss frequently into a watering can.