SS is 3 packs a day, water, black tea/coffee and nothing else
SS+ is either:
4 packs a day and 200ml skimmed milk
or
3 packs a day plus a 200 calorie meal.
If you are doing ss+ with 4 packs and milk, its entirely up to you what you do with the milk, you can use it for tea and coffee or to make a pack.