The statement "there is no moisture on mars<br ...

The statement "there is no moisture on mars
" is factually untrue.

For example, there is in fact known moisture in the 4 wet chemistry cells in MECA!

More to the point, given the known presence of Martian sunburface ice at km depths and the known increase in temperature with depth, then at some depth and pressure the water must be in a liquid phase -- moist -- and will "flow" up through permeable rock and soil to the atmosphere.

There is in fact a water cycle on Mars that involves the exchange of water between the subsurface, surface and atmosphere.

Here is an interesting paper on the Martian subsurface.

Here are some recent clouds over Victoria crater most likely created from the water rising from the subsurface.