In the book, Harry gets his Gillyweed from Dobby the house-elf who takes it from Snape's ingredients cupboard to help Harry survive underwater for the second Triwizard task.
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Harry Potter and the Goblet of Fire. The line is said by Neville Longbottom just after Harry has jumped into the Black Lake. Neville had previously given Harry some gillyweed with which to breathe underwater in the second task. As Harry dove he hadn't come up and Neville (being Neville) went to the worst case senerio and thought his gillyweed hadn't worked and Harry was dead.
The movie differed from the book. In the movie it was Neville Longbottom that informed Harry of Gillyweed. In the book it was Dobby the house elf. I agree with the above, but thought I should point out that Dobby is replaced by Neville a lot in the films. In Order of the Phoenix the book, it's Dobby who informs Harry about the Room of Requirement, but in the film, it was, yep, you guessed it, Neville!
HARRY POTTER YOU DUMMY!!!!!
Harry Potter 1, Harry Potter 2, Harry Potter 3, Harry Potter 4, Harry Potter 5, Harry Potter 6, Harry Potter 7, Harry Potter 8.
The first book in the Harry Potter series is Harry Potter and the Sorcerer's Stone(American title) or Harry Potter and the Philosopher's Stone(other countries). The last book in the Harry Potter series is Harry Potter and the Deathly Hallows.