I prefer to grind my own oats and soak them overnight. This ensures that they are fresh, the soaking (in water and a little lemon juice) will destroy the phytic acid, and they are sooo much better than anything you can buy in the store. An oat grinder really doesn't cost too much, especially if you use it every day!
I like to add a number of things, depending on my mood. Brown sugar, peaches, cranberries, cinnamon, raspberries, apricot jam (my favorite), or anything else that sounds good at the time!