Stephen Harrod Buhner has written extensively on fasting. I read his 2003 book The Fasting Path before attempting my first serious fast. The book was very helpful. It may still be in print, or you can pick it up used.
Hilton Hotema with his many other pseudonyms has a few books on the subject
Gzus cryst on YouTube and has many Ebooks on Amazon.gzus chryst
Dr. Robert Cassar on YouTube and Earther Academy
Mantak Chia's books are great tools to teach one to utilize the energetic body
For us, personally, using intermittent fasting under Dr. Cassar's terrain modification protocols have been most conducive. We work outside daily (gardening, earthmoving, general labor) and practice Bikram yoga with no energy issues. It does take time to clean the body and build proper energy channels within the body. Start slow, give it time and stay optimistic
The Miracle of Fasting by Bragg --- it's been years since I read this book, but I seem to recall that the info is about both juice and water fasting.
The Essene Gospel of Peace book 1 ---supposed to only be a dollar but for some reason it costs as much as a book. Got my copy for a buck years ago. Not a lot of specific fasting info, but it is on topic about fasting...and eating/living healthy. You can probably find a free pdf online.
I may have a few others, yet I don't recall the titles and I am unable to go look either..."they're currently on my bookshelf 800 miles from me."
I would recommend that you start with juice fasting/feasting. IMO, it's more productive and safer than water fasting. Then when you get some level of cleaning house going on you can begin to experiment with 24 hour dry fasts....and that's really where you'll begin to see significant detox which brings on rapid cellular regeneration.
YouTube stuff.... John Rose.... Lui-Gino Di Serio.... liferegenerator, Dan McDonald.... David Rainoshek.... robertmorsend, Dr. Morse....
My Food Forest - Mile elevation. Zone 6a. Southern Idaho <--I moved in year two...unfinished...probably has cattle on it.
I recommend the practice, even though I don't have any books to recommend.
I grew up fasting for 24 hours, once a month, for decades. They were fasts without food or liquid. They were difficult, hard, intolerable fasts. I hated them. Eventually, I left the religion that was requiring that type of fasting, so I stopped fasting. Then somewhere along the line, I started reading about the health benefits of fasting and undertook a fast in a way that works for me: With plenty of liquids, so that I don't suffer from dehydration.
The first 10 day fast I undertook, my systolic blood pressure dropped 20 points, and it has stayed down. I've adopted the time between Christmas and New Year as my annual fast. It's a ritual that I love. I set aside a week at the summer solstice as a Green Fast, where the only food I eat is what I forage and eat while in the garden. I fast for a day here or there, whenever I want... The thing that this sort of intermittent fasting has done for me, is that it has taught my mind and body that I don't have to eat on a schedule. I can go hours, or days, or a week without eating. I don't have to live from one carbohydrate crash to the next, my body has months worth of fat stored away that it can easily turn into energy.
I'm fasting these days as a lifestyle. I get to make up my own rules about fasting, because it is my body, and my practice. If I'm fasting while attending a Christmas party with family, I'll still have a bowl of soup, because the ritual of sharing food among primates is more valuable to me than slavish adherence to a set of rules.
Taking up fasting (in a way that works for me) helped me to break the carbohydrate-bing cycle that I had going on my whole life. Here's a photo from 20 years ago compared to now.