If you talking about drinking only water as your beverages but still eating, then yes, it will definitely help if you used to drink soft drinks a lot. But, remember that you need calcium so drinking just water is not a good idea. Water makes your metabolism burn calories 3% faster. Drinking water is important if you're trying to lose weight, some studies have shown that thirst and hunger sensations are triggered together.
Diets, counting carbs, etc they all seem to be ineffective to losing weight. The best diet is the one you can put together; the one that works with your body. Here are some tips and components to easily shed poundage.