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This question is pretty open-ended and has insufficient details to be able to form a solution. One assumes they want a continuous potable supply. With no power? I assume this means electrical power! From this I would say for a continuous supply then water needs to be manually pumped (or via horse/cattle power) or if fuel available to a reservoir at height sufficient to then gravitate to hospital. In central Africa this reservoir must be covered and provided with screened vents to prevent mosquito etc. access. The reservoir can be simply valved etc. to give a constant of declining rate flow to the hospital.

If the water is contaminated by microorganisms then filtration required - two small slow sand filters will do the trick nicely and no power required if at a suitable elevation with regard to the reservoir and hospital.

If the water has chemical contaminants e.g. arsenic, then wood charcoal layer on top of the filter would remove these.

Note that slow sand filter should also be covered to exclude light and insect ingress - but enable manual scraping/replacement of the sand.

There are photos of similar plants elsewhere in Africa and India for small local supplies.

The alternatives such as 'conventional' treatment would not apply (chemicals and power).

Hope this helps but I can't offer much more without more information!