Minecraft wiki entry for Clay_farming, associated text: First, you will need to build up 4 blocks and start placing some dripstone blocks in that height. You can do it in any style you prefer, such as strips or squares. Then, place stalactite dripstones under the blocks, and place dirt above it. Then, place the water in a spot where you can access it when above the dirt blocks, and fill up all the glass bottles and soak all of the dirt with the bottles, until it turns into mud. When the chunk is loaded the mud will slowly dry out and eventually turn into clay, and then you can harvest it and repeat the process of placing and wetting the dirt.