Lol I spend about 5-10$ a day on food. Where do these people eat at lol
https://www.businessinsider.com/photos-free-food-google-cafe...
You'll be able to make it healthier though, and tune it exactly to what you like.
When you get older, you start to understand food, and you are willing to pay more for it, but now you have to count calories.
Can I survive on $10 a day? I did it on $3 a DAY when my parents were on food stamps, but I am not that crazy about going back to the "franks, rice, and ketchup" menu.