This is quite a distortion of the facts to push an agenda.

Desalination technology can solve their problems completely, but they armed proxies that attacked the two countries in the region (Saudi Arabia and Israel) that can help them.

They also imprisoned the one qualified guy in their country who blew the whistle on their water mismanagement (e.g. farming water intensive crops in a desert), Dr. Madani.

You could read the Wikipedia page to learn the other man-made reasons behind this crisis. That's preferable than coming here to play defense for a corrupt theocracy. Not that I doubt that climate change is one of the causes.

Neither a distortion of facts nor is there an agenda. Maybe a counter agenda.

Tehran is far from the ocean for desalination. They are closer to Caspian Sea. But that comes crossing mountains.

Tehran itself is very dry.

And comparing spending on military exercises to infrastructure tells me you have a political agenda to support the dismantling of Iran. These are not friendly motives.

Iran has tried to make agreements with the western world for a long time. But the west has snaked Iran into isolation. Isolation has led Iran to exercise military excursions to develop influence in the region.

You think that's the only person that talks about the oligarchs excess farming? It's being talked about nonstop. The government just doesn't do anything about it.

Iran has desalination facilities(75 in 2022 to be exact). But not enough and obviously only by the water. Iran has way less energy production than Saudi Arabia, which per capita would put it at a 4th or so. That's with the fact that Iran is a massively industrialized economy which none of the states in the area are. A lot of the UAE and especially the modern desalination plants are built in collaboration with France, Spain, China and Japan. Desalination technology transfer and construction by third parties in Iran is specifically restricted by the US.

One of the things that would have helped Iran's energy problems is nuclear energy and we all know how that goes. It's kinda cute how you don't think that every single one of these facilities is a target for the US and Israel if Iran does not have any weapons deterrent. Iraq's civil infrastructure was leveled by the US in the beginning of the war in 2003.