Having been anorexic for three years as a teenager, I am personally against fasts such as these. In fact, I did a similar fast when I was 13 and that's what started me on fluid fasts all the time and eventually being down to 90 pounds at 16 (I was 5'7").
I am not saying this is everyone's experienc ewith fasting. Just make sure you really evaluate why you are wanting to do this, and see if there is a healthier way to "detox". Drinking just water and lemon/maple flavored water is not healthy.