A little thinking and planning helps if one wants to save one’s life. Every bakery has 5 gal. FOOD GRADE buckets with lids they throw away every day. I know because I got some. Chemicals are in paint buckets and I mean paint buckets that have never been used. Use them if you want poison in your system.
If someone wants to stay healthy enough to live, eat rice with those beans to have complete protein. Beans by themselves won't do it.
Right now, there are options to choose to stay alive and not die of malnutrition or poison.
Our Walmart will sell food grade buckets with lids for $1.00. If your buckets are not food grade, and you are concerned, just line the buckets with something, or wrap the product up.
For example, you could use seal a meal and just put your bag of flour (for example) in the bag, and vaccum seal it. Then stick the bags in the 5 gallon buckets. Label the buckets. Stack them floor to ceiling.