Information regarding output after treatment of the sewage

What is the volume of water (for gardening and toilet purposes) that can be generated after the sewage treatment?

I would like to know the volume of treated water generated on an average per kilo litre of sewage water. I am asking this question to understand the loss of water (in %) with each treatment to get treated-water that can be used for gardens and toilet-reuse. Thank you, Srividya