Insulting response lol, good luck with your thread ;-)
PS Movie & book the same, personally an alien organism that traps water is a bit more imaginative than people making cisterns.
For a start you could get Dune right, you have that world backwards. The sandtrout vector of the adult worms was responsible for locking up all the water on Dune not the Fremen. The leather membrane-like sandtrout were an alien species that considers water a poison and locked the water up by...