About the milks... I was a dairy junkie before I got IBS. I eat much less dairy right now (after I first went through a phase where I completely avoided all dairy products including rice/soy cheese and things with minute traces of dairy, but went stable, tried dairy and found what I can tolerate). So, it was super hard to switch to a dairy alternative initially. Expect this. Those milk substitutes just don't taste like milk at all. I think rice milk is the most similar, almond milk is the least bad tasting...
I found having oatmeal with water was a much tastier and better alternative than spending tons of money on dairy substitutes that don't taste like milk.
So, consider using water for awhile. If you don't like a dairy alternative, don't despair, there are others out there, and most of them dont taste good to the dairy junkie...
But do avoid dairy for awhile, no matter how hard it is and how much worse it tastes, it is so worth it to religeously stick to Heather's diet. Life is not all about food and being healthy and pain free is more important than having your morning oatmeal with dairy milk for awhile (that's my case, convert it to porridge and whatever else you eat with milk).
P.S. Forgot to say: if you are going to take Natural Calm or Mag Citrate or some other laxative, rice milk shouldn't be so much of an issue. If you are not considering taking those, however, I wouldn't drink rice milk.