Is it bad to stick to a water snack diet?

I think I'm overweighted now so if I ran a mile a day and stick to a 1 meal than for the rest of the time being water and snack diet, how many pounds would I lose in a week no better in a month. But I don't eat Breakfast and I'm staring to not eat after 6pm. Will I lose a to. Of weight? And consumer less than 1500 calories, how many weight will I eat and what time of day should I eat my one meal? Thanks, Racheal :)