Just got done with a Water only 120 hour fast. I had Never in my life went one day without food. I found it to be quite easy. BIG TIP..the last meal you have before the Start..Make it BIG and enjoyable. Drink Plenty of water..obviously - Bone broth can be used to help electrolytes, they do make 0 calorie electrolytes. I have only found those at like Amazon :(. CVS or Walgreens carry Ketosis Pee Strips, that can test and confirm that you are in Autophagy. got the BEST sleep of my life doing this! Remember even 1 calorie is enough to kick you out of this!! Afterward I found that it is quite easy to do, can be done, the only drawback is that your mind starts to think about what you are going to cook, LOL, and you have that time that you normally set aside to eat (that is now empty) During that time I would take a quick couple of blocks walk.