My tip would be to not have a time limit on your fast. I always aim for 3 days and see if I can go on any further. I'm on day 3 today and it#s finally over - I am hoping day 4 will be easier with less headaches...only time will tell. I tend to sip water all day and drink hot water and lemon. Saying that I did have a pepsi max today at lunch time as I was so bored = that is not recommended but it was either that or I was going to give up