Dry milk powder can be used for dairy products, including oatmeal, and can be made from oat meal, but the milk can be produced from milk powder and the milk must be made to a specific temperature.
The temperature can vary by as much as 20 degrees Celsius depending on the product, but it is best to be able to reach the desired temperature if making milk.
To make dry milk, the milk powder must be heated to around 60 degrees Celsius and then cooled down.
You can use liquid or solid milk powder.
In a liquid form, you will have to add more liquid and/or more liquid to achieve the desired consistency.
If using solid milk, you must be careful not to add too much liquid and you should also be careful to add enough liquid to ensure a consistent temperature.
Liquid milk powder will give you a very thick, creamy consistency and is also good for dry milk powders, but do not use this form of milk powder for milk and milk products such as oatmeal.
Liquid oat and oat protein powder can also be used, but you should make sure that the milk is not too thick and does not contain too much water or milk fat.
If you do not want to use a liquid product, then you can use a milk-free product like almond milk or almond butter.