Fresh made juice from a juicing machine would be the best thing. Fresh juice from nature to the body is the way we were meant to eat. Fresh juice contains enzymes and other genetic material that your body really likes. I was having 3 eight once glasses a day. Fruit juice in the morning, vegetable juice for lunch and diner. In general apple and tomatoe juice mix well with other fruits and vegetables. On there own they can be strong and you can dilute them with water. Also you can drink as much water as you would like. Your body needs at least 8 glasses normally so you will probably be drinking even more than that.
Besides the body being mostly water and needing water all this water helps to flush toxins from your body. Besides toxins being flushed through your urine, they will come through your skin also. This can cause eruptions in the skin such as pimples and blisters. This depends a lot on the amount of toxic waste built up in your body. As you further research fasting you will find that you can clean your colon after 3-4 days to help clean out crud and help the detoxification process. It depends a lot on why you are fasting in the first place. If you are just doing a cleansing fast of a few days you might not do a colon cleaning.
The healing benefits of fasting are just a little extra added touch. This way if you are fasting with the right heart you will be blessed with a closer relationship with God. The healing powers of fasting I believe are an added gift in recognition of following God's word.
The Bible and God's word are the bases of a humane society. Should it be a surprise that if we follow the teachings of God we will be Blessed greatly.
Matthew 4:2 After fasting forty days and forty nights, he was hungry.
Esther 9:31 to establish these days of Purim at their designated times, as Mordecai the Jew and Queen Esther had decreed for them, and as they had established for themselves and their descendants in regard to their times of fasting and lamentation.
Joel 2:12 "Even now," declares the LORD , "return to me with all your heart, with fasting and weeping and mourning."
Matthew 6:16 "When you fast, do not look somber as the hypocrites do, for they disfigure their faces to show men they are fasting. I tell you the truth, they have received their reward in full.
Matthew 6:18 so that it will not be obvious to men that you are fasting, but only to your Father, who is unseen; and your Father, who sees what is done in secret, will reward you.
As a disclaimer I am not advising you in anyway on what to do. Only you yourself know your body and what is good for you.
Juicing recipes can be found by doing a simple search. If you have a juice machine you probably already have a recipe booklet that came with it. There is a lot of information on the medicinal value of fruits and vegetables. It depends a lot on the reason for your fast and how much research you have done.
I myself read a quite a bit and found it hard to find specific information. This is at least partly because what is needed by one person is different than another. My daily intake of juice was relatively low, this could easily be doubled. The more juice slows down the detoxifying and rejuvenation process. Some people drink herbal teas which can also have effects on the process.
I ended up reading through peoples journals and diaries with there personal stories and descriptions of some of the things that can happen. Some things can be down right awful depending on the toxins, poisons and whatever are being released from ones body. It could be seen as a fight good against evil. God wants us to be good and healthy.
I have labored over this next statement. evil would like us to give up, Ex: anything that comes against your fast. sores, blisters, mind games ... But, God would like us healthy. He does not play games ...