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Well ... what if it is the case that we have a stream like this ...
...completely dry...
...and we only find water that is stagnant.
We know that this water, in this case, is accumulated by recent rains, so it's not too bad.
But, we'll never be sure.
So we are left with the classic appeal in this case, to begin with, and boil the water.
Boiling water, takes away the possible contaminations it might contain.
We are not going remove heavy metals or anything like that...
Here we have the water collected from the site.
And you just have to make it boil a little.