are already packed with moisture. look for a lot of dry rocks and heat them all.
once you are sure that the basin that you have created on the ground is well made, you can already place water on the ground basin. you can use whatever container that you may have to bring the water to the basin. it will be ideal if the place where you are going to get the water from is not too far since you might only end up with small amounts of water every time. make sure that the basin is full.
the moment that you place your rocks one at a time, you will surely 