You can prepare the rice at home and stash it in a ziplock bag (will keep in the cooler for 2-3 days).
Heat black beans and in a separate pot, heat the rice with 1/4-1/2 cup of water. Heat rice with lid until the water evaporates and rice is steamy.
Spoon rice into bowls and then ladle black beans on top. Add jack cheese on top of hot beans and then a big spoonful of salsa. Add diced avocado on top of salsa. Easy to make and healthy. Good for backpacking if you eat it the first night!