Ned generally sucked at buying food for himself. Yes, he was not going to be a kid for my longer and so he needed to learn, but he hated the whole buying experience. It stressed him out because how was he supposed to know if he needed three apples or six apples? He didn't want to waste food, even if there was a question of if environmental concerns were even a thing under a seemingly magical Dome.
Ned had been bent over picking up the green beans he dropped when he felt the cart hit him from behind. He straightened and already looked sheepish as he turned around. "Uh, no, it's fine. I was probably in the way. Had an, uh - accident." Wow, that sounded like he peed himself. He gestured quickly to the green beans just to make sure she didn't think it was a different sort of accident.