It’s not so much the fire in Alexandria that you have to worry about although that is what is remembered, it’s the people who are setting fire to the library of Alexandria that you have to worry about. A single fire extinguisher won’t necessarily stop people from killing you and then burning everything down anyway.

My suggestion would be to also include a machine gun and a couple of hundred rounds of ammo so that you can kill them first and stop the fire from ever being started in the first place.