As you're not keen on fermented foods, some vegetables and fruit with probiotic factors present a better choice. These include the onion family, artichokes and bananas.
I find leeks especially beneficial and that they have a very detectable calming effect on my guts.
F 5 ft 3. HW: 196 lbs. Primal SW (May 2011): 182 lbs (42% BF)... W June '12: 160 lbs (29% BF) (UK size 12, US size 8). GW: ~24% BF - have ditched the scales til I fit into a pair of UK size 10 bootcut jeans. Currently aligning towards 'The Perfect Health Diet' having swapped some fat for potatoes.