Ok... for the past 2 weeks i have been drinking liters and liters of water everyday, and i still see no change

Im not at all snacking, the only things i drink is LOTS of water, and a few cups of coffee, i never use sugar in my coffee or sweetners.
My son says its because there is no weight to be lost (Bless hes heart) how sweet is he!
My husband says, i need to workout. Now ive suggested we both go for a good 30 minute walk everynight, the weather is nice enough, but he doesnt want to, while he also needs to lose weight!! * UGHHHHHH MEN*