I bring enough water, hot coffee in thermos. ( keep me awake in the slow time.....)
Bags of self-premix cereal ( oat meal, corn flake, granola ,powder milk, raisin)
Plastic container with screw on top and a spoon.
Simple and cheaper than energy bar this way, and you can vary the mix to keep the suger level to your liking.
Banana is good, but don't pre-cut, it will turn black.
Always ready, just grab these bags and go fishing.