Hello Mateo. The secret to keeping that fresh-cooked taste in your rice and beans during meal prep is all about how you store and reheat them. When batch-cooking, let your food cool down completely before putting them in airtight glass containers, as trapping steam ruins the texture.
For the beans, try to keep them slightly undercooked if you plan to freeze them, and store the cooking liquid with them so they stay moist. When it is time to eat, add a splash of fresh broth or water before reheating on the stove rather than the microwave, and stir in a little fresh cilantro or lime juice to bring back that vibrant sazon.