Growing or buying your own real food and preparing it yourself is by far and away the biggest and best guarantee of the purity of your food.
Anything I an up like tomato sauce and pressure and veggies is as contaminant free as you’re going to get. No parts per billion of mouse droppings or cockroaches in this household’s food production facilities.
Not only can you guarantee the cleanliness, It tastes better, is healthier, and you know it’s fresh and where it came from. How much of the grocery store items ingredients come from countries that don’t consider us their friends? They put poison in dog & cat food, why not human’s food?