few bottles of water, maybe a sandwich and some trail mix for sure though. Anything that doesn't take a lot of effort, movement and noise to open and eat.

I don't think that bringing soft drinks is really all that good. Sitting out in stand all day, you get dehydrated. Pop/soda doesn't really help that out. Plus you can ration yourself on water to the point where you probably won't have to pee very often while in stand, but yet still get fluids in your body.