The info I have from the docs is that Imodium is not recommended as it 'turns' the bowels off / stops the rythmic movement and the bowels can be sluggish anyway. So this could swing you from diarreah to constipation.
It also depends on the cause of the problem. If it is a bug then the last thing you want is to stop the flow and trap the bug in there.
I was told that Kaomagma or other clay based treatment that gently thickens things is the best option.
dont know the BRAT diet is safe banannas, rice, applesauce and dry toast yummy, its not so bad and it really does help.