My Patriot Supply is good.
Also, some good old canned food from Walmart is good.
Canned goods and Mountain House dehydrated food.
Dried beans and rice. Beans pinto beans are loaded with protein and carbohydrates. The rice is pure carbs and calories. Also important is multi-vitamins. You will be very deficient in needed essential vitamins on a rice and bean survival diet. Lay in as much canned goods as you can afford. Get stuff you like as months of rice and beans is boring but it will keep you alive.
Most important is water. Get many many gallons of water.
Very important is how to cook those rice and beans. Get a small camp stove and several 5 gallon bottles of propane. Camp stoves are efficient. Chlorax is important. 1 teaspoon in five gallons of water will make it safe.