I make a big batch using 8 cups of water and 2 cups of oatmeal. You may cut that in half though. I add raisins to taste also (just a few) . I put it in the crock pot on "high" for 3 to 3 1/2 hours. (see below) Actually, I put the crock pot on a timer so it is ready when I get up in the morning. I then refrigerate the leftovers in single servings and use that the rest of the week by microwaving it.
Adding fruit, nuts or spices to your liking gives great taste and variety.
You may cook it on "low" for 6 to 7 hours of you prefer.