FYI, the black water in most creeks, rivers, etc. is actually drinkable as is.
Do I recommend it, hell no, it will give you the runs like crazy and it still carries parasites, but due to the high acidity most of the harmful bacteria don't thrive very well in it so you'll live, but you might wish you were dead.
You know, next time your lost in the swamp, no rain's in sight and the battery to your iphone is dead where you can't check on your Bear Grylls survival app.