What is the best method for filtering water in the wilderness if you have only a plastic bag?

Answer Fill the bag with a layering system of fine sand on the bottom, coarser sand or dirt on top of the sand and then coarser gravel or material on the very top of that. Pour the water through the top and leave a small hole or two in the bottom of the bag to collect the water.

It's not ideal and it won't take out parasites, but it will take out a good deal of contamination.

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