I’m gonna sound like one of those crazy people, but I cook my own pumpkins for pies. I don’t use the canned stuff. In the autumn, I buy a bunch of little pie pumpkins, quarter them, cut away the seeds and membrane, and bake them <span style="text-decoration: underline;">covered</span> at 350 for 2 hours. I let them cool in the pan overnight, then I pour off any accumulated water and push the soft pumpkin off of the hard shell. Then I blitz the pulp in the food processor, and stick the purée into the freezer in 2-cup containers, since 2 cups make a pie.
Mini pumpkins are cheap, but the yield is only about 1 c pumpkin purée for each whole pumpkin, so don’t expect a tremendous quantity out of this procedure. Also, the finished purée is a bit watery, no matter what you do; it still works in recipes, though.