The meth appears in *The Walking Dead* and *Arrow*, but it can't work in both: in *The Walking Dead*, the apocalypse begins in August 2010, whereas in the *Better Call Saul* finale—set in December 2010—society is still intact. I don't recall the specific *Arrow* episode where the meth appears, but *Arrow* starts in 2012, and the *Breaking Bad* finale shows that those who knew how to make the blue meth were either dead or—like Jesse—had retired.
