Nature makes all animals with a program not to eat everyday, otherwise nature would have failed a long time ago. So your internal ductwork will not collapse, it is quite thick and used to food not coming in all the time. All animals on the planet do not get to eat everyday, their duct work does not collapse.
If you want to heal your body and mind, don’t take anything but water. The whole point is that you need to shut down your digestive system in order for the body to use the saved energy to heal and clean. By the way, digestive system uses the most energy in your body. Lesser you eat better off you are.
Trust your body, it knows what to do when you don’t eat.