I have just decided on a whim that I no longer want to support the dairy industry and cut it out of my diet cold turkey. I've already trialed a run and I felt great but it was so difficult. Never realized how much dairy was in my diet in basically everything I ate and it wasn't long before I ran out of things to eat that didn't contain it. Even subjected myself to eating cereal with water which was extremely unpleasant. It's been hard but I know you're the community to ask for help because you've probably went through this sort of thing before.
just my personal opinion i love soymilk in cereal/coffee/tea that sort of stuff, some brands are also fortified with more vitamins including b12 (though most cereal ive seen also has b12). i can only do the unsweetend kind though, stuff like "regular" is too sweet 4 me