Dry fasting is no food and no water (or any drinks) for however long you can go. It’s done in many spiritual practices, typically for 24 hrs, but I am merely exploring it as a means to understand. The value and benefits (of fasting in general) are pretty good for cell regeneration, immunity, aging, and overall well being. I have never done a dry fast and I’m just warming into it to see how my body responds. If you’ve never done fasting, it is probably best to start with a water fast and ease into the time frame you’re comfortable with. I will warn you from my own experience, that too much water (without salt) can flush your kidneys and cause an increase in BP and could be risky. I learned this the hard way on a 4 day fast, I was drinking lots of water and nearly gave myself a stroke and had to do a hospital trip (lol in hindsight).