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Hi Arif
Am I correct in assuming that if this is a flood relief project, the main concern is short term minimisation of the risks of the usual flood associated water-bourne diseases (cholera, hep-A, typhoid, leptospirosis, etc.)? All of these can be controlled with adequate disinfection of all water intended for potable use. Leptospirosis is a partial exception as you can contract this from direct contact with contaminated flood water.
You mention community level and household level treatment. To me, if you can treat at the community-level and have an adequate secure water network delivering water to the point of use, community disinfection is safer and cheaper.
However, if you need to treat at household level, there are a number of questions in this forum that discuss the options including: https://archive.knowledgepoint.org/questions/927/use-of-lifestraws-in-disaster-situations/
We could give more specific advice if you give some more information. For example could you let us know what the existing water infrastructure is, and if/how it has been adversely affected by the floods? It would also be good to know if people have been displaced by the floods or are in their own homes, and if displaced, how long the displacement is likely to continue for. It would also be very helpful to know what the water source is.