Our expert says:
If you have any doubt about the safety of drinking water, then boil it or sterilise it with chlorination tablets (be quite sure you know how to use these.) Filtration helps, but its efficacy depends on the type of filter system - you may not be able to rely on it. Food that might have come into contact with contaminated water also needs to be cooked or peeled.
The risk for cholera depends very much on the area and your circumstances i.e. if you have access to municipal tap water.
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