Quantity for over night oats I cook Quaker Oats overnight and love it but sometimes the pre-measured packets make too too little food. I am interested in making my own servings using cups, but do not know what proportions I should use. For example, I heard on YouTube that 2 cups of oats per 1 cup of milk/water.

What is the best ratio of oats to liquid to prepare oats overnight?
Weigh the contents of one packet.
Check the packet instructions to see how much liquid to add.

That's your ratio, very precisely.

You can then apply that ratio to any measurement.