Major oil spill contaminating river and groundwater resources - alternative water supply?

A majoroil spill from a petroleum pipeline has affected 60 km perimeterof surrounding farms and villages

https://water.tallyfox.com/mosaic/text/oil-spill-tabasco-leaves-200000-without-water

and has contaminated the nearby river as well in Mexico. 200,000 people need an alternative supply of water. How should municipalities respond to such a crisis situation? What are the alternative solutions? Can the oil plume migration be arrested and isolated to a specific regionin the aquifer ?