If you are thinking about healing that relationship case with ONE SOUL SERUM, as you have started that post for a couple, here both partners need to take ONE SOUL SEERUM.
You can do by any method by writing names on paper or by direct request.
When you give through water/coffee/food, it should be taken by all people who are intended to patch up or settle peacefully even if they are getting separated.
And not only by a single person, because they need to get connected at soul level to even part peacefully or unite happily in any other case, if not above