bread is good, it will thicken your output, and thicker output makes less noise.
i would def stay away fromthe fruits and veggies for now. some veggies cause more gas, broccoli is bad for that, but fruit isnt really too bad to do that.
Soemthing you can do when you go out is to cut out some squares of towel and stick them in your pants over the bag and that will really help muffle the noise.
And also, most of the time other people will not hear it. alot of hte time, i say, oh goodness my thing is acting up, and my husabnd will say, what i dont hear it