Chlorination is usually a ...

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Chlorination is usually a safe bet for neutralizing bacterial pathogens.  For parasites, sand filtration is adequate.  Here is an interesting link (http://hwt.co.za/potable-water-treatment/disinfection/).

Reliability is always key.  This implies readily available stocks and if need be, suitably trained operator staff.  Our operations in RSA often make use of stabilized chlorine pills.  They last for a while and are easy to administer.

Disinfection is very site specific.