The Question and Answer section for The Hunger Games is a great resource to ask questions, find answers, and discuss the novel.
According to Cato and the other careers, there is nothing salvageable from the explosion.
The other tributes are poking around in the mess, looking for anything to salvage, but there’s nothing. The boy from District 3 has done his job too well....
Haymitch advises Peeta and Katniss to stay alive.
“Here’s some advice. Stay alive,” says Haymitch, and then bursts out laughing.
Note, Haymitch does not give advice in Chapter Three. The above quote is from the fourth chapter of the novel.
Over the course of the games, having known hunger and finding ways to assauge it can be a integral part of survival.