Why would you WANT to purge?! I mean don't get me wrong, there are plenty of times I have wanted a quick way of getting out all the calories I just spent the last hour binging on, but exercise, drink a lot of water and restrict calorie intake. Please don't TRY to purge. It's not something you should want to do. No one should WANT to harm their body. That's why bulimia, EDNOS, CNS and anorexia are MENTAL DISORDERS. They are addictions...don't force yourself to have an addiction. If your body doesn't want to purge, do yourself a favor and please don't start. I made a post a few day ago about things I read that people use to make them purge, and someone brilliantly said, "I prefer to use my fingers. Why put something toxic into your body when what you are doing is already harmful"...not in those exact words, but along those lines!
If it's something you truly feel the need to do, well best of luck I guess because we here can't change your mind anymore than you can convince me that the sun is cold.