Here's a classic vocab list. It may seem silly, but some of these words may turn out to be extremely helpful should the zombie apocalypse strike.
El zombi – the zombie
El refugio – the refuge / the shelter
La plaga – the plague / the infestation
La infección – the infection
La civilización – civilization
La humanidad – humanity
Esconderse – to hide
Agua potable – drinking water
El generador eléctrico – the generator
Morder – to bite
Correr – to run
Acercarse – to get closer
Cuarentena – quarantine
El walkie talkie – the walkie talkie
La frecuencia de radio – the radio frequency
Comer cerebros – to eat brains
Also, here's zombie resistance member Dan broadcasting the conjugation and uses of tener, ir, and hacer in the present tense from the Forest Hills survivor camp:
Lastly, here are seven cult zombie movies in Spanish:
REC (2007, Jaume Balagueró & Paco Plaza)
REC 2 (2009, Jaume Balagueró & Paco Plaza)
REC 3: Génesis (2012, Jaume Balagueró & Paco Plaza)
REC 4: Apocalipsis (2014, Jaume Balagueró)
Cementerio del terror (1985, Rubén Galindo Jr.)
El ataque de los muertos sin ojos (1973, Amando de Ossorio)
Apocalypze (2011, Fernando Chávez)