You need to allow your computer to show hidden folders. Once that's enabled, navigate to the location for your operating system below:
Search for "Supply" values. The game stores food and gas as 4-byte integers. Changing [0x14 0x00 0x00 0x00] (20 food) to [0xE8 0x03 0x00 0x00] (1000 food) is a classic manual mod. death road to canada save editor