If you’re going to go through that much hassle, you’re probably better off just duct taping a fire extinguisher to the top hole of the cone so it can be used multiple times.
Not a chemist so I really wouldn’t know what kind of extinguisher to use without it becoming dangerous and/or ineffective.
Plus people forget how heavy a bag of water can be (number 3) https://www.toptenz.net/10-crazy-improvised-prison-weapons.php
