The most obvious and immediate solution is to treat sullage and sewage on a localized basis, and increase the number of lakes and water bodies. Delhi has been able to produce drinking water from sewage. The administration needs to sit down with experts, not those with Ph.D.'s but those who have done practical conservation and recycling work. Don't award contracts to political cronies, otherwise it will be like the Ganges purification project. Bangalore receives a fair amount of rainfall, harvest that water and conserve it.

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The most obvious and immediate solution is to treat sullage and sewage on a localized basis, and increase the number of lakes and water bodies. Delhi has been able to produce drinking water from sewage.
The administration needs to sit down with experts, not those with Ph.D.'s but those who have done practical conservation and recycling work.
Don't award contracts to political cronies, otherwise it will be like the Ganges purification project.
Bangalore receives a fair amount of rainfall, harvest that water and conserve it.