Chosen answer:When Jason brought her brother's backpack, you can see a small table next to the mattress with some bottles and cans, there is also something what looks like bag of chips (or maybe marshmallows?). I'm sure that he knew that she needs food, and brought her something from campers or cabins.
Answer:A young healthy person can live without food for 30 - 60 days "if" they have a regular source of water. They would be severely malnourished and probably barely functional, however.
Chosen answer: When Jason brought her brother's backpack, you can see a small table next to the mattress with some bottles and cans, there is also something what looks like bag of chips (or maybe marshmallows?). I'm sure that he knew that she needs food, and brought her something from campers or cabins.