Stick a sample under a really powerful microscope... if it is good enough for all those little animals to live in it must be fine for us to drink it as well...
But hey, some one suggested to get your wife to drink it first....
Many years ago when I was going out with the lady who would become my wife, we were travelling through the Buller gorge... we stopped... she who is still my wife now, was thirsty but not very outdoors/bush savy... She grabbed a mug and took a scoop from a cool clear bush brook... and being the courteous type offered it to me first... I declined said I was fine... so she enjoyed it... There was a little left so I finished it off, and spat it straight out again... yuck I said, there is something dead in the creek.... Poor girl went green, blue, then pale.. then saw a twinkle in my eye..... silly girl still married me.
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