Do you have hot (>100*F) tap water? You do? Good! Congrats on not living in sub-Saharan Africa! Take some of that shit, dump it on top of the oatmeal, and stir it up. Keep adding a couple cups at a time until it's all nice and wet. Then, let it sit for 10-15 minutes. Stir it once or twice while you wait, and add water as necessary to maintain saturation.
Or, you know, just dump some fucking water on some oatmeal, stick your hand in it, and figure it out for yourself... nah.
Last time I did a pair bit of oats and just used hot water from the tap a lot of mixing with the spoon but works same as cooking it I think. The previous lime I mixed it with a hand blender it went really think n sloppy like cake batter and felt nice, I highly recommend doing that technique.
I've taken a 5 gallon bucket, a few big things of Quaker instant oats, and some hot tap water from my tub's faucet. Used my arm to stir it. Worked perfect.