Whilst browsing Pinterest this morning I found a excellent document published by the USA government organisation, the Centers for Disease Control and Prevention, about water treatment methods. This is a particularly useful, one page pdf description about the ways to treat water when wild camping and their effectiveness against various water borne pathogens.
Water treatment methods
a guide for individuals intending to use untreated or poorly treated water as a drinking source
Link to the CDC page – A Guide to Drinking Water Treatment and Sanitation for Backcountry & Travel Use.
More about water – Backpacking water, bottles and bladders