The resources you and the refugees need to survive are abstracted as Provision Points.
One Provision point sustains a person for one day (and consists of fluid and stable food). Consuming only half a Provision Point per day sustains a character, but leaves that person distracted and irritable. A person who eats only a half portion takes a -2 penalty on attack rolls, damage rolls, ability checks, and saving throws until they consume a full portion. A person who consumes half provisions for more than three days a week must begin making Constitution checks each day to avoid taking nonlethal damage.
A character can construct a temporary shelter sufficient for one Medium-sized creature with a successful DC 15 Survival check and one hour's work. For every 2 points by which this result exceeds 15, the shelter can accommodate one additional Medium creature. Sleeping without shelter leaves a person fatigued. Sleeping without shelter a second day leaves a person exhausted, which persists until the person can get a good night's rest.
Each day, an NPC can be assigned to perform one task around camp or generally employ skills on your behalf. The most useful such projects include:
Assist: NPCs can assist you or another NPC with any skill they are trained in.
Craft: With access to the necessary tools, NPCs can craft finished goods for you upon request, using normal Craft skill rules.
Forage/Hunt: If you spend a full day hunting/gathering and succeed at a DC 10 Survival check gain 1 Provision Point. For every two by which you exceed 10, you provide a single additional Provision Point.
Herds: NPCs can recover a single goat or sheep with a successful DC 16 Handle Animal Check. Then, captive animals can be maintained with a single successful Handle Animal check (DC = 10 + the number of animals) per day. A captive animal generates 1 Provision point every three days in the form of milk (and eventually cheese or butter), or can be butchered to immediately provide 2 Provision Points.
Scouting: NPCs trained in Survival or Stealth can scout the area for you.
Standing Watch: An NPC can stand watch, attempting Perception checks.
Support: One or more NPCs can follow you to assist you on your tasks.
Using Skills: NPCs can use any of their listed skills on your behalf.