That's some hard times. If MIB(men in black) food supplies run low, i would expect them to keep returning on scavenging runs.
It may be time to start planting food in the surrounding landscape vegetation, where it blends in. Preferably where their fires won't reach.
Maybe some landscape stashes of food also. Natives up here used something called a food pit, where they could hide food in the ground.
I assume your guys know what spider holes are:
https://en.m.wikipedia.org/wiki/Spider_hole
If you have to exit the area it is handy to have spider holes readily spaced for resting along the exit routes.
Kindest regards
We have planted food in various places and we forage too. Kind of hard to hide 21 people in spider holes, but we do have a few for our look out guys. We do have a cave where we can hide out if need be.
That would be a lot of spider holes, i was figuring 3 holes per person in the landscape around my house, with maybe 5 more leading to a nearby lake.
I think I would be digging for a long time! LOL Perhaps even draw some unwanted attention...
Yeah, 21 people is a lot to hide in the landscape. Lol