Milk in a cup for breakfast

The boys have had 2 successful weeks of milk in a cup for their bottle prior to dinner so I decided it was time to start for breakfast. Once we hit the 2 week mark, we will be looking to remove the nighttime bottle. The only problem that we are running into is finding a cup that holds more than 5 oz. Jackson and Connor generally take 8 ounces in the morning and evening. We squeezed 6 oz into the cup and need to find something larger for the nighttime..