Favorable weather conditions and confidence in your spot are a must. Hunting all day is all mental, if I don't have confidence in a spot or weather conditions aren't the best, I find it impossible to sit all day. To me those are the two most import things, then comes drinks, food, pee jug etc. The reason I put those two things before water and food, is because if those two aren't right, I want be in the stand long enough to have to worry about the rest.