I have been using the first chapter of the book and the film in a unit about food for my pre-AP Spanish students. I first read the book while I was in college and saw the film when it came out in the theater in 1992. I start with a brief overview of the Mexican Revolution and then we read the first chapter. I have the students listen along then we pause every so often to answer questions and look for examples of Magical Realism. The students get very interested in the relationships between the characters and start rooting for either Pedro or the physician to win Tita’s heart.
Here are some resources for the book and film:
https://www.tes.com/teaching-resource/a2-como-agua-para-chocolate-study-booklet-11063982 (you have to register; it’s free)
http://www.languagesresources.co.uk/SpanishA2Literature.html (scroll down to the “Como agua para chocolate” resources)
materials for purchase https://www.teacherspayteachers.com/Browse/Search:como%20agua%20para%20chocolate
film and lesson plans for purchase https://filmarobics.com/like-water-for-chocolate-como-agua-para-chocolate?search=chocolate
A text called Graded Spanish Reader: Primera Etapa by Cengage Learning has pre- and post-reading activities for the first chapter.
The textbook Encuentros Maravillosos chapter 7 has an excerpt and comprehension questions.
Reading guide on ISSUU
Unfortunately, it looks like these guides are no longer available: