The SWF should only be done first thing in the morning on an empty stomach. Doing it mid day will wash out the days nutrition and cleansing components of the lemonade.
I can only assume that GSE is Grape Seed Extract and you don't want to add to the lemonade or anything else for that matter. You don't know what effects it will have in an empty system with no food to buffer it's absorption. You also don't know what effects is had on digestion and the effects of the alkilizing properties of the lemon etc etc. Specially this being your 1st you should do it by the book. The MC works in a very simple elegant and proven protocol just as written. If it ain't broke don't fix it ;+D