Regarding food supplies, sometimes a person has extra supplies, there is nothing wrong with donating them. The most important thing is not to turn it into a business.

Turning it into a business, buying and selling, taking supplies from here and there and selling them, that's the issue. But if the supplies have become your property, like if.

You bought the supplies and cooked rice and invited people to eat, or gave it as charity to the poor, if it is cooked, it's the same, there is nothing wrong with it inshaAllah.