Wolf wrote:Usually not many parasites found in rain water especially if you let the rain rinse things off first, same with chemicals as long as it rains for 15 to twenty minutes before you collect which gives it time to rinse off surfaces as well as to clear out most airborne pollutants.
Ground water is a different ball game. Water filters are the best way to deal with this type of water. My water comes from a spring that fills a 1000 gallon tank with an overflow outlet so the water is kept fresh. I installed filters in the house that I change out now and then I originally put the filter in because the cats and dogs were getting kidney stones and then the filter ended that, but I inspected the water system and found that the spring water was feeding into an old very small concrete cistern that was falling apart. This was the source of the stones, so I replaced the entire water system with new waterlines from the spring to the brand new sealed 1000 gallon water tank and then the lines from the tank to the pump and then I replumbed the entire house up to the water filters. I have not had I problem since although I get the water tested every now and then.
The main thing with hauling your own water in a tank is to sanitize the tank each time before refilling it. This will reduce the chances of any biological contamination. I would use ordinary household bleach provided it does not have and added scents or stuff and then allow the tank to dry. Any remaining bleach will dissipate in a few hours after filling.