When I was in Borneo during Confrontation each pilot would have a Bergen with his survival gear consisting of rations, water purifiers and whatever else he wanted to take along.
In addition to extra food I took a carton of Rothmans and a pack of cards.
The plan was to sit in the shade smoking and playing patience. In no time at all somebody would look over your shoulder and tell you that there was a red eight to go on a black nine.
You're saved!