Mexico City is well inland from both the Pacific Ocean and the Gulf of Mexico.
That’s what pipes are for.
If you can transport oil in pipes all across the country, there is no reason why water can’t be piped.
“Mexico City is well inland from both the Pacific Ocean and the Gulf of Mexico.”
In the 70’s, we built a pipeline that crossed Alaska. Building a couple of desalination facilities off-shore and piping the water inland should be no big deal. Technology and manpower is already there.