You can make your own clay by harvesting soil and filtering out the clay content with water and a fine sheet.
You can make your own clay by harvesting soil and filtering out the clay content with water and a fine sheet. Most soil has some clay content, and the yield will be higher if you find high clay soils. Fill a bucket with clay-rich soil and water and let it sit overnight. The sand and silt will sink to the bottom of the bucket, while the clay will be suspended in water. Next, filter out the clay from the water using a fine mesh or piece of cloth. You can let this dry in the sun for a few hours until it is workable. This method is experimental based on your soil type and firing temperatures.