Hey, i have just finished day 7 and i will give you a break down of what you might run into.
Day One: Kinda ok to be honest, you feel hungry alot, but no other real side effects other than pee'ing, ALOT.
Day Two: BAAD day, your body is really missing the food, and you want nothing more than to go get something really meaty and filling.
Day Three: Same as day two, but you also feel really crappy to boot.
Day Four: Things start to lighten up a little, Ketosis is starting to kick in and you only have to fight your mind telling you your hungry.
Day Five: Things really ease up here, you still have a bit of hunger and stuff but easy to ignore.
Day Six: I don't even remember much bad stuff, the big K has kicked in and all is good.
Day Seven: What diet?
You have to have a strong will to ignore food. I am at uni so the house is full of junk food and constant smells of people cooking, but i find hiding away when it gets bad in my room helps!
I drink 2-3 liters a day, i can't handle anymore yet, but it seems to be enough. Stop drinking large amounts around 7-8pm, so your not up all night pee'ing hehe.
Good luck!!