Hello,
This is my understanding of a home or bush water-purification system.
Get two buckets, one with a hole in the bottom.
1/3 Fill the 'holed' bucket first with stones, then fill with 1/3 gravel, then top it with 1/3 sand. Hole your bucket filter over your other bucket and pour the water slowly. until the botttom bucket is filled.
Repeat until water is as clear as possible.
Then either;
Boil water for ten minutes.
or
Add Iodine tabs (wait for half an hour for the residue to settle)
or
Add 1 drop of bleach per litre
leaving you with drinkable water.
If you suspect water is contaminated with radioactive particles then you can even make a bastic distillery out of a sausepan, a sausepan lid, a cup and some metal wire.
1/2 Fill the sausepan with water
Suspend the lid upside down above
attach the cup to the bottom of the upside down lid
boil the water
the water vapour will condense on the lid and drip into the cup
in other words.. you cannot take the radioactive particles out of the water, so you take the water out of the radioactive particles!
I hope all that makes sense.
Any corrections to my methods are most welcome!