I don’t know if it’s obvious yet, but followers returning from faction camp missions are reasonably refreshed, with 0 sleep deprivation, 0 thirst, and hunger reduced by the food they just ate. So if you keep a dozen or so followers constantly busy at a faction camp, they will mostly manage themselves.
Since it’s fairly easy to have 9-15 companions out on missions (1 logger, 3 gatherers, 3 foragers, 2 trappers, 1 hunter, 1-3 building upgrades, 1 scrapper) you can cycle through your followers and keep them watered and productive.