First, keep in mind that this is only my fourth pulled pork so I am hardly an expert. I didn't add anything to the drippings before adding. However, I only added a little of the drippings as the taste was very intense. I would say I added about 1/2 to 3/4 cup for both shoulders.
I didn't add anything else and they were fine for moisture when I had some a couple of days later. I like to leave the choice of sauces to others as well. The drippings just added a bit more seasoning taste in my opinion. When I served it, I did add some of SoFlaQuer's finishing sauce and had mustard sauce and KC sauce on the table.
Thanks for the help, I am a big fan of a vinegar mustard sauce on the pulled pork.