Paper (newspaper or office paper)
looks so pristine, but terracotta
will fire at lower temperatures)
About sodium silicate "Magic Water" to join coils and fix cracks (a low temperature fire may be sufficient)
Fine mesh fabric such as muslin
The clay can be dug up from your backyard or bought rock and debris free. I chose the latter type of clay to use.
There's a simple method of preparing your own dug up clays that I found interesting. (Watch the master potters of San Marcos here!)