That's just the short version. Lol. The details are in the Megathread if you expand the spoiler.
The idea is based on the Create Food and Water spell. 45 pounds of food feeds 15 people for 1 day. So, 3 pounds = 1 person per day. Translate that to 10 Camping Supplies per pound, 10 on average for Short rests, so 5 per SR, and 20 per LR.
Add Survival skill to it and spells and viola. That's where I got the idea.