As you're not meant to add anything to the soups I suggest making the choc or vanilla latte shakes with hot water instead of having them cold.
I've had a stinking cold for a week and have been taking day/night nurse followed by boots own-brand version all week, since last saturday. To be honest if that means i don't lose weight this week (unlikely) then i don't much care - i'd rather feel better now i am so close to goal.
Good luck, and keep taking paracetamol tablets and lots and lots of water and hot tea/coffee also helps soothe a sore throat and clear up the mess in your sinuses and chest if it's got that far.