In such a fanfiction, Naruto might start by relying on the kindness of his friends. For example, Sakura could offer him some food from time to time. He could also look for odd jobs around the village, like helping with construction or farming, even if it's not something he's used to. Another possibility is that he might barter his ninja skills for food. Maybe he'll offer to protect a local merchant's goods during transport in exchange for a meal.
Well, Naruto could try to fish in the nearby rivers or lakes. It's a free source of food if he can master the skill. He might also participate in village competitions where the prize could be food or money to buy food. And who knows, he could even start his own little garden if he can get some seeds. After all, he has the determination to learn new things, and growing his own food would be a long - term solution to his food affordability problem.
Naruto might approach the Hokage for some assistance. Given his status as a ninja and his contributions to the village, the Hokage could potentially set up some sort of stipend or assistance program for him. He could also explore the idea of sharing meals with other ninjas in a communal setting. This way, everyone chips in what they can, and Naruto gets to eat. Additionally, he could look into the possibility of trading some of his old ninja gear for food or money.