My friend son put the breast pump bottle in her mouth of some else now my friend is scared if there was any leftover breast milk in bottle goes in her son body. transfer hiv , hepatitis or any other disease?

Infection is related to the number of viral or bacterial particles (the "dose") so a single exposure would be less likely than multiple exposures over time. There is a very, very small risk, and possibly the best route is to observe the baby rather than interrogate the other mother as to her HIV status (or any other disease). A conversation about your worry could be helpful - or not.