I have been Fasting for over 20 years. My first fast when I was a teenager for 11 days !!! Have done 14 to 16 days safely-and I am not overweight...and More 22 is my record...and with Water only. You have the added Luxury and nutrients of the Lemonade which should help as well.
A Good Indicator if your Body is Ready to end a Fast--look to see the conditon of your tongue. The white coating disappears after say 14 to 16 days. You have to Worry When your tongue begins to bleed--the Tip of your tongue. THEN is when your fat reserves are used up!!!