I can make black powder but there are more than a few times where dynamite would be called for. In a situation like this things like abandoned cities and landfills would be turned into veritable mines for getting things like wire, metal for scrap.
Sorry Jesse, but a paramedic while nice to have wouldn't be compared with somebody who might be able to synthesize morphine. Or make soap. Things like bicycles would have a very limited shelf life. Where would the materials for tires come from? What good would a bike be when there is no such thing as a road anymore? Thing is, you'd be able to put your ability to adapt and to learn to good use.
Chemist, I know how to get yeast from culture. We would start by harvesting wild yeasts from the air for sourdough and then keep refining the process down until we get yeast. It might also be something that could be gleaned from the abandoned zones and then nurtured. The yeast that wineries and breweries use had to come from somewhere.
Anybody got soap? The contest will be running for a couple more days. Let's get creative. Don't forget bribery and flattery, those will all be useful skills.