Do a search. This has been mentioned before... if no tripod, you can still shoot, via high shutter speeds and a small aperture, you just capture the bursts as it appears, not the whole process of fire, bloom, etc...
Tripod must have for fireworks
best is get a remote too
use bulb mode ISO 100 F...er...last time i used 8 or 11 cant remember
with remote in bulb mode you have more control
Or else you can set it to maybe 5 or 6 secs and keep firing i guess:sweat:
To me , tripod and black card is must have for firework shoot. Without them, u can still try w0rking on high iso, and continuous shoot thru the sequence, and hopefully u get a good catch. Desperate measure for desperate situation.