After a few discussions, Jun decided to ask Blake to help him gather a lot of food and buy strange things, as long as it looked unique they could buy it if it isn't too expensive.
There was a limited amount of food and the production was on the lower side. The government and military enforced a ration system which limits the amount that a person could buy. With the number of people Blake had together with Jun's hard-earned money from befriending Bernard, the goons set out to buy things to their limits.
Food can only be bought with food stamps. To get food stamps, one must trade money or goods on various channels. Survivors could go to the official exchange channel set up by the government or directly trade with other businesses at the marketplace.
The most common way to earn money was manual labor. Pack mules would be second, and whoring yourself would be the third.