What are all the ways that exist in the game to generate resources other than scavenging? e.g. the upgraded watchtower has an action to trade influence for a few ammo resources. You can generate food resources by building a garden/greenhouse. I believe you can generate fuel from food if you research the right thing at the library.
Are there any ways to generate construction materials or medicine resources?
I know you can build outposts on those resources, which seems to lower your daily usage, but that doesn't last indefinitely.