Welcome to the forum and the world of fasting. Five days is a good start, I hope you get to your goal. You will have hard days at some point when you will face detox symptoms but don't give up, it will pass. Keep us posted with your progress so we all learn from your experience.
Since you are new, I am sure you have done some research, just drink distilled or filtered water, keep warm and rest. No supplements or drugs, or chewing gum, or teeth brushing.
How much weight did you lose in five days and how different you feel?