marcward86 suggestion of a biosand filter is right on. Here is the guide for how to make one.The Biosand filter is fully described here: www.cawst.org complete with a downloadable manual.It is built with 2" of gravel at the bottom, then 2" of smaller pebbles, then 21" of sand on top. It is a version of a "slow Sand filter". The bio layer builds up over about 30 days and will then purify the water. Until that time you must boil, solar purify, or chemically purify the water before drinking it.The filter may be made in other containers than the concrete container that is described. Plastic barrels, trash cans, large diameter pvc pipe, and many other clean water tight containers can be used.Cities use "slow sand filters" on a larger scale to supply entire cities with safe, clean, pure, drinking water.
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charcol filter, then boil it
go down to walmart buy a gallon of 'clean' water for $0.70
I pray that you may always be able to go to Wal-Mart and buy your water, but do not count on it.
many designs available.
I heard that a reverse osmosis filter is very efficient when used with well water. The same can be said about rainwater ( I think!). The only drawback I heard is that this system wastes some water in the process.
If you collect the rainwater in a container that you know to be clean, the water will be fine, although, if you live in an urban, smoky area you may want to skip collecting the first minute or two of a shower as the dirt is washed out of the air.
If you are unsure about the state of your collection system (eg, it may be harbouring algae or other microbes, or might be home to insects), then a simple filter and boil is all you need to render it safe.
Where I grew up, the mains water supply was taken from a small rain-filled lake, and the only treatment between lake and tap was to filter out the lumps. Tasted (and still tastes) fine, I'm fine, the people that still live there and drink the water are fine.
you should build a biosand filter.
i don't think there is an instructable about it, but they are very simple.
it involves a trash can, with a layer of large rocks, medium rocks, and sand.
it depends on
how clean is the air ?
do you collect all the rain water ? the water in the first minutes of the rain is not as clean as later
how do you collect the rain ? how clean is your collection system ?
it may be anywhere between suitable for immediate drinking and not suitable for drinking at all