Based on what surviving hostages have reported and going by the fact that medication meant for them never reached them, not much.
For as much of a bastard as Netanyahu is, you can't fight a modern war effectively without bombs (or else you get stagnation like in Ukraine, where air defenses on both sides make use of bombers difficult to impossible) and the hostages wouldn't be in danger of getting bombed in the first place if Hamas hadn't abducted them from their homes and started this war.