This thread is already a bit old, but anyway: licorice root tea is said to be good against colitis.
Licorice Tea: Cleanses the colon; promotes adrenal function; decreases spasms; recommended to treat hypoglycemia, bronchitis, colitis, diverticulosis, gastritis, stress, colds, nausea and inflammation.
Scientifically this isn't proven, but drinking a few cups of licorice tea is not a big risk and definitely worth a try. I've made some good experiences with licorice tea with symptoms that appeared like colitis to me, but I've never consulted a physician with this so I can't tell you for sure. After a few cups of licorice tea my self-diagnosed colitis went away.
Licorice tea is quite cheap and since it's also good against bronchitis having it in the house is never a mistake. Just give it a try.