I carried a screw top plastic container, about 6"x6", with ice in the bottom. I stored my Yves or Lightlife Deli Ham (vegetarian), a container of carrot sticks, salad green mix, and maybe a little cheese in there. Then I carry some hoagie rolls in my bag for sandwiches. Other things I may have - Granola bars, salted-in-the-shell peanuts, snack crackers. When the ice melts, I use it for spare water, if needed. I refill the ice at convenience stores along the way.
I usually stop for breakfast, after 10-20 miles of early morning riding. Lunch and snacks is a picnic with the above. And dinner may or may not be out.
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Jim
Make a BOLD Statement While Cycling!