I made all #2's baby food. #3 we did BLW which was fantastic. #1 I actually used mostly store bought food because I was so overwhelmed as it was! And he also had sensory issues so wouldn't eat anything other than finely pureed store bought food.
My favourite finger food for going out and about with #3 in the early days was roasted pumpkin cubes. He loved them and they were nice and soft for a beginner. I would put them in a little container in a insulated lunchbox with an ice brick. I would cook them most nights while I was cooking dinner, just popped some in the oven while I was standing there so it was no extra hassle.
Once he got the hang of BLW, I would make frittata type things with vegies, cut into cubes and freeze. Then when we went out I would just pop it into a container and it would defrost by the time I needed it. Another easy going out food was fruit. Watermelon cubes and grapes (cut in half or quarters) was a staple food for him.