Here at EIIPH we are up until now self sufficient in all our home water usage except washing laundry. All our drinking, cooking, bathing, gardening, and dishes water falls right here on the property.  We have at present approximately 750 gallons of storage capacity and get about 25" of rain a year.  For in home use, we catch the runoff from about 350 square feet  of roof with about 700 gallons of storage capacity.  The 50 gallon tank we use for gardening at present and it actually catches a large roof area and we hope to install a bigger tank there after speaking with the property owner.  Others on this part of the island use water from a community well which is in generally good condition but is about half a mile away and is rationed in the summer time.  I saved money on our water storage by building my own tanks.  I read an article in Mother Earth News about making them with tar paper, polyethylene sheet plastic, and 2"x4" 16 gauge welded wire fencing.  (make a circle of the fencing on a level spot with sand or soft ground, line with tar paper, then line inside that with plastic which is cut large enough so the edge ends up above the fence all the way around, with the middle down in the bottom) I added my own design touch by adding a circle of black polyethylene water pipe around the top to hold the shape (held on by tie wire) and then adding a cover, in one case made of plywood, in another made of plastic, both with screen to divert debris.  Another tank was opportunistically acquired from an ex oyster farmer who had a large solid wood and fiberglass rectangular prism that was previously used as an oyster hot dip tank.  i just put a plastic liner in it and had a water tank. We have another small tank inside the house i built with wood frame and again plastic liner for water storage during the freezing months.  For now we will have to thaw water in the outside tanks with an electric stock tank heater.  We have  a 12V DC rv pump in the house and the shower and kitchen sink are plumbed with 1/2" pex.  Rather than try to get the water totally sanitized, we pump it through a simple sediment filter to get it into the house, and then all of our drinking and cooking water goes through a simple gravity berkey filter, we use the Travel Berkey.  The most expensive part of the system was the actual plumbing, especially the pex fittings. We did save money on the shower by just using the bare pex fittings and valves, and i built my own concrete shower pan and coated the wood walls of the ex sauna with multiple layers of polyurethane to shed water. It drains out into a mulch basin, to be covered in a later update.  I hope something in here will serve as inspiration for someone out there.  Comments, questions, suggestions of any kind most welcome!