You'll find Smitty in the junkyard on the far west end, past Lara's gang's house. Give him the meal and he'll trade you a stimpak. If you head back to Mom's, she'll offer you a meal that restores a few Hit Points. You can decline it and come back later if you're not in need at the moment.
- It's possible to fail this mission, if you take too long (at least a day) Smitty will just go to Mom's. There's no penalty except missing out on a stimpak, some XP, and free food. It's possible to gain the XP anyway by talking to Smitty after this and selecting the correct dialog option.
- Also, if you intend to finish this quest, do it immediately. The children will likely to steal your stuff. Also, Mom will not speak to you unless you bring the meal.