So i am staring loose it but cant?

Well its going on day 3, i'm sure of it this time. Okay this morning i had the flim, brushed teeth with water only, fine. Checked my weight 348lbs fine again. So why did my stomach start growling and still is, my mouth watering with every smell of food...i want doritos so bad right now, but i cant seem to bring myself to buy the bag...why? I was drinking distilled water but with the film it left a bad taste in my mouth so i switched to spring, its okay for now. Also i am starting to notice a slight body oder, now i know i washed my ass before school but its like the smell was light but once i got in the car to go home, i smelled it more. So when i got home i showered again and scrubbed my entire body, but a slight oder still lingers...i cant have this while in class, yuck! Its embrassing as a student, a medical student at that! So how can i fix this without breaking? And one more thing, i find myself that i'm not drinking that much water, reguadless if its distilled or spring...and i do drink when thirsty but still find it not enough...should i force myself to drink more?