Team Nelson,
The standard way to provide for fresh drinking water throughout the Mid-South and Appalachians for more than a 100 years was to build a cistern, and keep it full by diverting rain water into it from the roof.
When I lived in Memphis, I met dozens of people who were born and raised in rural Mississippi in the 1950s, who all said that that is how they got all of their fresh water growing up, and they never got sick from drinking it. No chlorene or other chemical was ever added to the water.
If you drive through small southern towns in the mountains of Virginia, you will see lots of old homes, where this system was plainly in effect.
This system was popular in areas where the soil was so very sandy that you couldn't hand dig a decent well, or so rocky that it was impossible to hand dig a well.
A cistern is nothing but a round or square concrete vault, built underneath the ground about 6 feet from the side of the house. It has a removeable concrete cover (at ground level for cleaing the whole thing out once in a while). It also had a round spout hole for filling it up, with a small cover over that as well.
The roof from which you get your water has to be metal. Nothing else will do.
The guys who grew up with this system said that keeping the cistern full was assigned to one kid in the family about 10 years old. The gutter spout on the side of the house was not kept hooked up to the cistern. It was made so that you could swing it out from the house, and then have it pour down into the cistern.
Whenever it rained really hard, it was the kid's job to wait five minutes (to let all of the bird poop wash off of the roof), and then run out in the rain to the side of the house, remove the small cover over the fill pipe, and swing the gutter spout out from the side of the house so that it lined up over the fill pipe, to let the cistern fill up. The water in the cistern was then pumped into the house with hand pumps or electric pumps.
If that cistern ever ran dry though negligence of the kid, . . . he got the tar beat out of him!
Regards,
Mannyrock