By Clark Collis
August 04, 2014 at 07:26 PM EDT

How do you make one of the best low-budget horror movies of the past few years? With a lot of booze and no underwear. At least, that’s what the folks responsible for zombie film The Battery claim in the trailer for a making-of documentary—which will be included among the bonus extras when Scream Factory releases the film on Blu-ray and DVD, September 16.

Shot for just $6,000, The Battery stars writer-director Jeremy Gardner and Adam Cronheim as a pair of former baseball players trying to survive in a post-zombie-apocalypse New England. Watch the trailers for the movie’s behind-the-scenes doc, Tools of Ignorance, and the film itself below.