Here, we’ll go over the important aspects of water. The collection, storage, distribution, separation for potable/grey usage, and purification all are equally important.
Lets go over some of the different methods for a water catchment system or rainwater harvesting system.
One key factor in moving forward to an off-grid water supply system which doesn’t utilize underground water is your area must have 24 inches of rainfall per year in order to supply your needs. Take a look at some of the great information found here on the brie-offman blog.
Cistern: These are excellent systems for long term storage of potable water. The proper planning will allow you to practically allow you to take this on as a DIY project. Check out Slow Sand Filter for a DIY Concrete Block Cistern project outline and their personal experience in doing it.
Purification: Purifying water for ingestion and cooking can be done with many different setups. Here I’ll provide several of those by giving links and images. Princeton University has published a paper on water purification here.