What Are Some Foods That Don't Produce Gas

So there seems to be many food which give a person gas, I'm not a person who has a problem with it most of the time. But I have heard after my operation in July I will probably experience some problems with severe gas pains and such for a while. I'm sot sure of this but what are some foods for me to eat in case it does? I don't want anything at all that is full of anything that will irritate my stomach and such w/ gas cause I already have an illness that can trigger symtoms of various stomach upsets, which has been in remission for a long time now.