Rainwater harvesting / Discussions

Hi I just bought an off the grid cabin I want to put in a green water collections and water and waste management system can you advice what is the best one to go with and an idea of cost in B.C. Canada 

...rainwater harvesting garden / system cannot be combined into one area.   If you mean feeding rainwater into your natural pool from roof runoff, I would see no problem doing that with a metal roof, but shingles, particlularly older ones, may deposit toxic debris in it. This page would be  great place for you to start re...