Mix oatmeal and water in a bowl until well combined.
Cook the oatmeal in the microwave for 2–3 minutes until it becomes porridge-like.
Boil water in a pot and add a little vinegar.
Crack an egg into gently boiling water and poach it.
Serve the oatmeal porridge in a bowl and place the poached egg on top.
Sprinkle with salt, pepper, or desired toppings to finish.