I will be interested in what Doug finds out.
In the mean time I will keep drinking tea when I camp.

If I was where I had no way to treat the water and risked dying of thirst, I would drink the water and risk just getting sick instead of dying.

Even if the bleach tablets do not kill all the Crypto it takes care of almost everything else, and I would rather have a treatable case of Crypto than be dead.

Note that Crypto usually takes a week and a half to hit you and usually only lasts a couple of weeks.
(It is harder on kids, the old, and aids victims.)

I would worry more about stuff like Tularemia, Dysentery and Cholera.