You’re morbidly obese, fasting wont hurt you in the slightest. You have enough body fat to roll 168s. Don’t take this the wrong way take it as encouragement. Don’t be scared you can do it. Yes you can drink snake juice on refeed days, watch Cole’s Death Fast Protocol video for more info on that.
it really depends on your overall health.
from a fat availability in order to sustain the DF days, there is evidently no problem at all: from that point, you can do 72s quite indefinitely.
From the other health points, I think you have to consult a doctor in order to have you controlled during your journey.
At the end of this journey you can weigh half of your CW so take it seriously: in this case, safety and consistency are the things that matter.
Keep going and update us.
Safe? You can do up to 12 day dry fast if you have the willpower. Yes dry fast as long as you can, if you are going to do a refeed a good idea is watermelon which is 92% water. You will even lose weight on your refeed :) Good luck. It would be good for you to post a before and after to keep you accountable and other motivated on this thread.
Good luck mate