The cous cous is definitely free on green/EE. Is the water plain or flavoured? If it's plain then it should be free but some flavoured waters have a syn value.
By the way if you have questions about syn values there is a special forum for them otherwise the main board gets really cluttered.
I have just searched for flavoured water on sw syns online and it says no products found, I will ask in group today and let you know if anyone has an answer x