Free: Contests & Raffles.
Keep in mind, light in, heavy out. If you 4 get lucky and have to pack out your gear, food, and game in the first couple days you might break those horses getting everything out in 1 trip, or on your 2nd trip out. So keep in mind that everything needs to be feather weight.
tortillas, brick cheese,salami,peanut butter,bagels,hot sauce,dehydrated potatoes,rice,and don't forget fruit and tang.
Sounds like a good idea as long as you can have a fire. Remember alot of places i.e. wilderness areas don't allow a fire.