In chapter 5, John is at school where we meet his teacher, Miss Plimsole.  Miss Plimsole gives John’s class a test that will show her how well they have been learning their arithmetics.  Then, John gets thirsty and goes to the drinking fountain.   But when the water touches his mouth, it turns into chocolate!  Then, he tries the one on the second floor, but it turns into chocolate too!And when he gets back to the classroom, his pencil turns into chocolate but the chocolate touch gets stronger and turns the whole pencil into chocolate.

Elton