Sorry that I have to disappoint you but 4 days without liquids will kill you or atleast take you to the verge of dying. Please google (how long can you survive without water). Your dry fasting technique is a dangerous one and just stupid from a physiological view as its contradicting its own purpose. I doubt people are able to not drink for 4 days since they JUST CANT. Its EXACTLY the same as not breathing for 15 minutes. Please try it for yourself. If you failed there you can try not drinking for 4 days.
Its not that I dont know what I am talking about when it comes to medicine. And in the Internet you will find a lot of trash backing up anything I could you explain how stupid it is to not drink for 4 days and why you die when you do that down to the smallest detail but I wont. You just have to have faith in me or try it out for yourself. If you know someone who did 4 days without drinking (willingly) keep in mind, everybody lies (most of the time to themselfs).