Want to recycle water used for bathing and washing clothes in slum areas- Please suggest methods that need to be adopted

I am a first year engineering student. I am planning to set-up a water recycling plant in a slum area. I am planing to collect water used for bathing and washing clothes and recycle it.

Please suggest the processes that are required to make such water drinkable. And what can be the cost of setting up such a plant with a capacity of 15 kl to 20 kl.  

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