You can definately put everything in the same point. Remember you arent trying to "mix" them. You just want to put it in your ass. When you mix test and winny in the same point, is there some kind of chemical reaction that happens? No, they will stay seperated. You are right water and oil wont mix, but thats what we want when we put them into the same point.
Bottom line: put everything in there and put it in your ass!