SOLVED. (March 2023): Horror Short Stories collection. Cursed fountain of youth drink in pop machine. Slumber party girls have same dream of projectionist being murdered. Music teacher murders his students. Read in 1990s. [s]

[Miss Dee]

Read this book as a preteen in the 1990s. Collection of short horror stories. Included many but the three I remember include a modern pop machine that holds addictive, cursed pop made from water from the Fountain of Youth. Another story involves an entire slumber party full of girls that all dream the same dream, that the birthday girl's mother murdered a film projectionist who had been the girl's father's original girlfriend; and a third story about a music teacher who murdered his students and turned their bones into piano keys.

[Kristy]

Could it be one of these series?

https://www.goodreads.com/series/7204...

[Kris]

Miss Dee, is this book for teens?

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[Becca]

Shadows and Whispers: Tales from the Other Side by Collin McDonald looks like a match. The soda pop fountain of youth story is 'The Soda Machine', the slumber party one is 'The Slumber Party (the titles are really imaginitive!) and the piano one is 'Rumors'.
Here's a copy on archive.org if you need to check inside - https://archive.org/details/shadowswh...

[Miss Dee]

Becca, you solved the mystery! That is the exact book! Thank you all so much for helping me. Just ordered it on Amazon!

[Kris]

Great! Glad you found your book, Miss Dee. Thanks for the update.