I have to dis agree with sophie19 on some parts. First of all if you are drinking fluids all day up to 6pm how can you get dehydrated? Then in two hours you at 8 pm you are drinking one more of Epsom Salts . You will loose a lot of water through butpee, but then it is matter of another two hours till you drink Olive oil and Grapefruit juice mix. If you feel that the smell of olive oil is making you nauseating then close your nose tightly with your left hand and gulp down the mix. Smell is what gets people, you will not taste anything if you are not breathing with your nose.
Just do it it will be great experience for you. Next day you must do the Epsom Salts in the morning because you do not want all junk seating in your intestines, you wanna flush it out.