I personally think that the oatmeal can be cooked and eaten later

The oatmeal can be put in a pot with a proper amount of water, and cooked on medium heat,

During the cooking process, you can add milk or sugar and salt and other seasonings to taste.

Western wheat oatmeal can be put directly in the cup,

with boiling water or hot milk for brewing,

mixed after two or three minutes can be directly eaten

Thanks.