Please follow the guidance I have given this is the correct most up-to-date information.
It is vital that you drink the extra water specified ('extra' means it is in addition to the water you use to mix the sachets). Cups of tea and coffee can be taken in addition. On this step, you should drink your tea and coffee without milk or sugar although you may use a calorie free sweeterner. If you do, use a tablet sweetener, not the powdered kind that comes in a jar or sachet.
There are still some discrepancies between booklets which are under review.