has a video about how to get workable clay out of any sort of dirt, by means of sedimentation. This saves you a ton of work when making terra cotta items The contestants on History Channel's Alone survival show need to learn to do this and to make containers for storing water. They'd need salt glazing on any of such products intended to be cookpots. Food residues can poison you if all of the internal surface is not subjected to boiling water. That's one of the reasons for disposable chopsticks and kebab-skewers.