Having a trusted water purification system is, imho, the best way.
Look up the Lifesaver's system (membrane technology).
I have used one for a long time and have never had 'Montezuma's revenge' tummy despite putting in some pretty dodgy water at times. In Morocco I always used wells without any worries.
Tip: the Ortleib square bucket and a long length of cord make life much easier.
For vehicle use: Lifesaver's jerrycan http://www.lifesaversystems.com/reso...technical-info. Provided there is some water around, it saves having to carry a whole load thereby reducing weight. 20,000 litres of pure water per filter.
If you are on 2 wheels, they make bottle version.
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