Hearty Corn Chowder with Smoked Sausage

Name: Hearty Corn Chowder with Smoked Sausage
Ingredients: 1 tablespoon(s) garlic, minced; 1/2 cup(s) onion, chopped; 1/4 cup(s) green pepper,chopped; 1 package(s) smoked sausage, sliced; 1 tablespoon(s) olive oil; 1 can(s) corn, drained; 1 can(s) cream style corn; 2 teaspoon(s) salt, or season to taste; 2 teaspoon(s) pepper, or season to taste; 1 stick(s) butter; 1 cup(s) half and half; 3 - russet potatoes, cut into chunks, skin on if you like; 1 1/2 cup(s) instant mashed potatoes, (thickener); 4 cup(s) water