I wanna know too, mostly because anything beyond 4-5 days, I have the same issue… and when I try to drink, of course I drink with electrolytes in, but even when diluted properly and sipped/drank gradually, it still causes diarrhea (gross I know, but important to know, if it happens to anyone else), which just exacerbates to issue since I’m losing more liquid than I’m intaking.
I can go 3-4 days without drinking issues, so for now I’m sticking to 3 day fasts with a day of eating in between. It might be worth it to stick to shorter fasts and roll them, if 2 days 1/2 or 3 days work for your goals.
Are you consuming electrolytes?
Your body does sweat less but you should aim for 2l at least, you may not feel dehydrated but 1/3 of a liter a day is dangerously low
If your pee isn’t clear most of the time then that’s a major sign you aren’t getting enough fludis