I had some Gypsum Mining Claims outside of Las Vegas... I was experimenting and built me a Mini Mud Hut using sifted Gypsum and water... I made the Round Floor Surface, then started forming individual bricks, which I set in place, one at a time... When completed, I let it dry completly, then fired it up in a kilm for a couple hours, then let it cool off... After cooling off, I dipped it in water so the Gypsum Crystals could re-crystalize and bond...
My thought was making a larger one out at the mine since the mine had a little Spring flowing on it, but I never did get around to it... If I had gotten around to it, I would have let it dry completely, then filled it with wood to light it on fire... Needles to say, that never became a reality...
But if all Hell Breaks Loose, I could still go out there and try to survive on Lizards...lol...