Currently I glean most of the material for my composts. Neighbours recently saved a trip to the tip because I pulled up with my wheelbarrow and asked to take the loads away. I often take my wheelbarrow for a walk scavenging for material. Peter O has been getting into the habit of dropping off shredded paper from school (if only I could get hold of the White House's pile right now). We collect horse poo from the nearby horse riding ranch and, as I've mentioned before, we weekly collect the food scrap bins from a nearby cafe. As we have now started to harvest food, we have increased our green waste which, in a closed-cycle ecology, is not really waste at all.
As you can see in the below picture our soil is highly disturbed, largely compacted clay. Intensive mulching, to keep moisture in the soil (which attracts worms who break down the clay), together with intensive composting over the next several years should see a dramatic decrease in water usage.