Take a large pot and add your chopped onion, carrot, and garlic; add a small amount of water so that it doesn't stick. Cook this on medium to high heat string and add TB of water as needed. Cook these until the onion is mostly cooked.
Now add your potatoes, water, corn water, vegetable bullion, milk, parsley, salt, and pepper stir this all together. Cook on medium heat until the potatoes are soft, then add your 1 cup of instant potatoes and cook for another few minutes until your desired thickness.