Canning:Sterilize-Sterilize your canning jars, lids, and rings by boiling them in a pot of water. Fill and cover-Carefully fill the jars with the hot filling, leaving an inch of headspace and removing air bubbles. Then place the lids on tightly. Process- Process in a water bath canner for 20 minutes. Allow to cool and then store it. It will last for at least 3 months, but usually longer.
Fridge: An opened can of pie filling can store for up to 1 week in the refrigerator if kept wrapped or closed tightly.
Freezer: Fill half a gallon-sized plastic ziplock bag with the blueberry pie filling and squeeze the air out. Then close it shut tightly. Lay it flat and freeze for up to 6 months.