We could just build a desalination plant and a pipeline for the water. Seems a lot more sensible to me to eat the actual costs for extraction than to keep buying it from other places where they either don't care about the environmental impact or it's just folded into the price, and we become wholly dependent on those suppliers.

Extracting it isn't really the problem, it's literally bubbling up to the surface in the form of mud. The water is just needed for dilution as part of separation.