At the cafeteria in my workplace, they serve oatmeal.
I like oatmeal, but not with milk.
How I can check if it is with milk or water without tasting it? There is nobody to ask.
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Colour and Smell.
Oatmeal with milk is always whitish than oatmeal with water.
The left one is with water and the right one is with milk. Colour shade will vary with the type of milk and sometimes people use the combination of milk and water both.
Also milk Oatmeal always smells different, so you can smell it too.