For myself, my motivator was the visual fat on my belly.
Supplements: Salt (pink or redmond real, or celtic sea salt), potassium and magnesium (those 2 if going 4-5 or more days)
Refeeding: Start with a couple eggs (cook whites, leave yokes as raw as possible) or a bowl of bone broth. Wait half an hour after finishing, then a normal high fat, low or no-carb meal. Eating carbs after fasting will cause you to gain back all the water weight lost as well as trigger more insulin than non-carbs which is the fat storage hormone.