hypothetical/real question/concern: i have to imagine that getting sick from bad water depends upon quantity drank (drunk, drinked?) and the number of "zumies" ingested? say i take a swim, dunk my head or even drink "bad" water from a cup that i had used moments earlier to dip said bad water into my dirty platy for filtering -- i probably will have ingested some water -- which is very different from drinking 8 oz. of dirty water straight ... or is it?