Heat the remaining 2 tsp. oil in the pan over medium heat. Add onion, green pepper, chili powder, cumin, and oregano; cook, stirring often, until the vegetables are softened, about 3 minutes. Add beans, roasted red pepper, and water; bring to a simmer. Cook, stirring occasionally, until heated through and thickened, 3 to 5 minutes. Remove from heat. Stir in lime juice.