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A simple water testing kit can be obtained from Aquagenics https://www.aquagenx.com which we have succesfully used in the field in disaster response . It is not instantaneous but can give test result for E.Coli in 24 -48 hrs with minimal equipment
In agreement with the comments a Sanitary survey ( and ongoing monitoring) is an an essential component and that water quality at point of use rather than at collection is what is most important.