How do ducks get water?

Puddle ducks,like mallards and black ducks,eat mostly aquatic vegetation.Often they can be observed tipping upside down,reaching the bottom in search of food items.Other ducks like mergansers and scoters,feed mostly on fish and small creatures,which they obtain by diving under water from the surface.People used to hand feed ducks in parks,but this practice is being outlawed in most areas,because it makes the birds depend on humans for food.