Clean water use for data center use has literally zero impact on water situation in Iran.
Datacentres don't consume water.
There is an ongoing public discussion here whether they should be built next to rivers or the sea for that purpose.
Iran probably hasn't built (m)any of those yet but that will be the next step.
Yes, they do.
For example, only 60% of Equinix’s DCs use closed loop, non-evaporative cooling systems…
https://www.cdotrends.com/story/4492/balancing-energy-and-wa...