Dairy Free Chowder

Name: Dairy-Free Chowder
Ingredients: 0.5 cup vegetable oil, divided; 1 small onion, diced; 2 stalks celery, chopped; 2 slices bacon, diced; 2 medium russet potatoes, peeled and diced, or more to taste; 1 (8 ounce) bottle clam juice; 2.5 cups minced clams, drained; 0.25 cup all-purpose flour; 2 cups almond milk; salt and ground black pepper to taste