Free: Contests & Raffles.
We bring two 65 guart yeti's, each one has frozen meals such as chili, spaghetti, stew, steaks, etc. that keep other items like butter, milk, cheese, egg beaters etc. cool. One mule gets a cooler on each side they fit right in the panyards. Creeks work fine for beer not sure about food but I guess it could work in a pinch.
Well, if you can bring a Yeti 65, then that's a no brainer. As for the creek, we did 7 days last year in 40-75 degree weather in September, and kepy all of our meals double ziplocked in a creek. Worked very well.
We always froze our meals in ziplocks, wrapped in newspaper (used later for the woodstove), put all the food in banana boxes, and packed tight in between them with newspaper. The boxes were kept wrapped in mantie tarps and hung in the shade to be in compliance with grizzly bear regulations. Meat would go in a small soft sided cooler that was kept inside the food box.I'd be leery of leaving food in the creek where critters can find it, but if it works go for it.