When canning pie filling, recipes use Clear Jel as the thickener. It produces a thick, clear consistency and survives the heat treatment of canning.
But locating Clear Jel is a challenge. If you are in the St. Mary’s, KS area, stop by the Sugar Creek Country Store and pick up your supply of Clear Jel (Cook Type).
For this and other sources for Clear Jel, go to www.rrc.k-state.edu/preservation/canning.html.