You need water to be able to take a dump. You need water to remove toxins from your blood. You need water for your brain to function. You need water for osmosis to occur in order to transfer vital nutrients and mineral between cell walls. You NEED water to live.
Dry fasting is PURE MENTAL ILLNESS. Please stop doing this to yourself. Going without food is okay, you can do that for a few weeks if you want but going without water is EXTREMELY bad for you, even for a few days! Please stop buying into pseudo-science and fake spiritual cancer like this online. It is HARMING you.