Here is the recipe for air dry clay/ cold porcelain clay:
Ingredients:
1 cup Elmer’s Glue-All glue
1 cup Corn Starch
2 Tablespoons Mineral Oil or Baby Oil
2 Tablespoons Dry Facial Cream from Ponds or Equate
1 Tablespoon Lemon Juice Concentrate
1 Tablespoon White Acrylic Craft Paint
The following video will teach you how to make Diy Air dry clay/cold porcelain clay from start finish:
A Joyful Clay Tutor 