FMD is 1000 calories the first day, then 600-800 with less than 16g protein, 50-100g carbs, and the rest fat. There’s a kit for several hundred dollars, which contains of food I don’t eat. I do macadamia nuts, avocados, some fruits/veggies/dark chocolate, maybe some vitamins, supplements or electrolytes. Meat and dried would hinder the process, but a little heavy cream is OK.
I’ll do FMD 2x or 3x a year with the first few days water fast. Someone with fat to burn could do it up to monthly.
I like Cronometer to track macros and nutrients, while my wife uses My Fitness Pal.