Basically don't consume any food or calories at all, for more than 3 days. Mostly just drink water. Tea or coffee is allowed but no sugar or milk. And take th

Basically don't consume any food or calories at all, for more than 3 days. Mostly just drink water. Tea or coffee is allowed but no sugar or milk. And take the water with some electrolytes. Can be a bit of table salt, or get more complicated by adding other salts like magnesium, potassium, etc. For a fast longer than a week, it is also good to have bone broth which brings in some extra nutrients like phosphorous.