All CO2 is produced by condensing it out of the air. It is all the same. It is all pure. Some tanks are certified as food-grade, but it is meaningless except as a legality.
You want to put a check valve in the line to avoid getting beer in your regulator.
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