I have problems preparing porridge. I have made thin and thick porridge. Both times, porridge came out of the valve and contaminated the cooker and the shelf. As a result of my blindness, I had the mixing ratio explained to me: 1 measuring cup of oatmeal should make thick porridge with 5 cups of water and thin porridge with 6 cups of water. Is this really true? How can I make porridge without impurities? Thanks for the support.