Prefer to hunt all day, unless it's over before that!
A meat sandwich, bag o'nuts, protein bar, 2 apples/pears - "graze" throughout the day as needed.
ALWAYS a water bottle and some sugar free gum to keep hydrated. A few pieces of "hunt candy" to munch on as well.
The bladder relief question is not fully figured out yet. If on the move, no problem, but if on stand, that's usually the time to get down and get on the move.
Never sat all day, but some sort of bottle would be required, I guess. Clearly marked as to contents!