Welcome to the forum.

Fasting with water only means just that, no supplements, no toothpaste for brushing teeth, no mouth washes, etc. Drink warm water as per thirst, distilled or filtered water works best. Rest plenty and keep warm for healing to occur. Take one day at a time. First few days will be very hard and you will have hunger pangs. But after three days you will have no desire for food.

If you have to break your fast for any reason, do not despair, there is always another time.

Keep posting here for support.

Good wishes.

Archus