This means that they will eat and they will not be in poverty. They will have plenty to eat. The word "bread" is a synecdoche for food in general. This litotes can be translated positively. Alternate translation: "a land where there will be plenty of food for you" (See: [[rc://en/ta/man/jit/figs-synecdoche]] and [[rc://en/ta/man/jit/figs-litotes]])
This is a generalization: they will lack nothing important. Alternate translation: "and where you will have everything you need" (See: [[rc://en/ta/man/jit/figs-hyperbole]])