Good for you for trying this, I am a big fan but would recommend you take precautions. I will list a couple of tips for you and for whoever is planning on doing a water fast.

-Before ever doing an extended water fast, I would recommend starting with smaller fasts of 24 hours, then work up a bit from there.

-After a day or two of fasting, its a good idea to add a little bit of salt (Ideally pink salt) to your water, to up your sodium levels so you don't just directly flush all water drunk straight out.

-You can still use any supplements that are in the form of a tablet, but not with liquid inside (Like the standard omega 3 tablets) as these have calories and would cause a slight discontinuity to the fast. Ideally potassium is a good supplement while fasting.

-Break the fast with something very light on the stomach, maybe watermelon and other light fruits. Your stomach has been closed for business for days, and if you chuck a steak in there it won't be at all happy!

-You can still drink tea and coffee, but no milk or sugar added! Coffee really helps to take away the hunger.

-If you are planning on still working out, take it easy with lighter sessions.

Keep up the hard work man, for me the hardest is the second day, then surprisingly it gets a bit easier! Its a great way to shred some extra pounds and your muscle mass won't be hardly affected. Also as a natural detox!

Enjoy your first meal, whatever it is your tastebuds will go crazy!