Burping may be the symptom in another problem -
H.
pylori infection of your stomach, which may be confirmed by a breath test.
Having non-acidic foods is a good advice, also avoiding vit C, aspirin and other acidic analgetics like ibuprophen. Also avoid anything sugary, including all fruits or fruit juices. Prune jice is the worst choice here.
You won't solve diarhea with any diet, you have to check and treat C-diff, if this is the case.