Fast. Water, electrolytes, black coffee/plain tea only. That's the best way imho. Prepare for it, make it last at least 3 days (5 is fine), the break it with fr

Fast. Water, electrolytes, black coffee/plain tea only. That's the best way imho. Prepare for it, make it last at least 3 days (5 is fine), the break it with fruits and fats (avocado are nice).