An unreliable narrator, as the name itself suggests, is a type of narrator whom you cannot trust. This narrator isn't completely sure about what he or she is doing, his own actions, emotions, and thoughts are often erratic; they might say one thing at one point in the story, and then something completely different at another.
We have insight into their mind, and we can see that the thoughts are all jumbled and incoherent. If the narrator is unreliable, it just means they cannot be trusted, which is the case in "Top of the Food Chain" as well.
Lets see! You can do a story of a man that is tying to get his gardening done all by himself and then he finds a snake in his grass and hes trying to get it out but it wont leave. He tries all of these ways to get the snake out but they dont work and then a young man tries to help him but he wont allow him to help. Until eventually the man tries to pick up the snake and then gets bit he then looks around at his yard and then he see's that if he had just have listened to the young man his yard wouldnt have been ruined. You can do something like that! Just add some dialoge and some ideas and you'll be good!