Drink three to four cups in the morning before breakfast, it will help you with your weight and digestive system.
Carry a 1.5L bottle around with you, if it's in your hand you will want to drink it all so you don't have to carry all that weight around hahaha.
Everytime you have a coffee or tea etc drink one cup of water.
When you go to the kitchen to make food, have two cups of water before you make it.
Take a bottle of water to bed with you, if you wake up have some (make sure it is at body temp., also this is much better than tap water as at night your tap water isn't being 'used' therefore you are drinking 'dead' water it will also smell and be full of chemicals)
Also try and use glass bottles for all your drinks (I admit I don't do this but *really* should)