I've worked in fire restoration. If there was smoke, there will be soot. You can take a white cloth and rub it over surfaces in the apartment to see how bad it is. As for food, the general rule is when in doubt throw it out. If cans are blown out from heat, toss them. If food was exposed to smoke, toss it. If the power was out for a long time, you may have to toss any refrigerated or frozen food. If there was no smoke in your unit you might be fine.

Feel free to dm me if you have further questions.