Preparation for DS surgery

I still dont have a date for my surgery but i know that they shld inform me way ahead to sit on a liquid diet 3 weeks before the surgery.. during these weeks i can drink only BOOST shake 5 bottles per day. it's gonna be so tough.. 3 weeks not to eat something but only to drink.. n nothing to control the appetite, it's kinda of very very tough i guess..

i called the home care support office to see how it works, they told me that only my doc can evaluate my situation so if he decides that i need this service, he should write them a letter so a nurse will come over 3 days only, if i need extra days so i have to pay for it.