H2O Challange - who drinks & who drowns

Got in my 2L yesterday. I haven't finished today yet. But I normally drink a liter during my Insanity workouts. Or at least what I was told was a Liter. About 33oz is a liter, yes?

I'm new to this and this is my first challenge. Can somebody tell me how to enter your progress and also if you enter it every day? Thanks in advance!

How much exactly is 2 liters? Will it actually help me lose weight? If yes, I'm up for this challenge! Hopefully it will help me lose some weight! :d