The basic perry recipe is like the basic cider recipe: add yeast to juice. Check the ingredients to be certain there are no preservatives (ascorbic acid is ok). Like apple cider, it can take 4-8 months to be at its best.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk