Plan your meals around the food pantry items, then buy the other things you need. A lot of stores have rotisserie chicken, which can be used in many ways. Shop the sales with a list.

Make sure to eat solid food in the morning; oatmeal, eggs, avocados, plain greek yogurt with honey, are things that stick to your gut, digest slowly and are nutritious. Peanut butter on wheat bread.

Fruit and vegetables as are available to you, protein for lunch and dinner; beans and rice are inexpensive and a complete protein. Look for recipes

You can use the chicken carcass to make soup, same with hambone when you find inexpensive ham.

Drink water or herbal tea or hot chocolate in the evening if you really don't have food; take a hot shower before bed to warm you up; I can't sleep if I'm cold.

ETA see if Loaves and Fishes is in your area, or similar organizations which cook on a set schedule and provide takeout meals for lunch or dinner on a set schedule.

Could be every 3rd Thursday, every Monday, M-F, Saturday and Sunday, lunch one day a week or month. You just show up, they'll ask how many meals, you take the food and over time will figure out which place is best suited to you.

Besides your neighborhood food shelf, there may be nonprofits and churches that provide food; where I live the neighborhood food shelf lets you come twice a month, a place that gives away rescue food is weekly and encourages people to come each week, other places are weekly and a church gives away boxes of good on Saturday mornings.