The approach of this design is all about the essential - in order to find a pure shape one has to spot the essence of things.
The solution for a particular design always means to find a certain answer to some questions. This pure shape answers one simple question: what stands as the basis of the water element?
The water drop has all the characteristics which make a shape pure/perfect, while also representing an archetypal image of timeless fluidity.

This bottle shape is relatively easy to produce, using a regular industrial method [blow and blow]
One important element of this design is the bottle cap, because it continues the lines of the bottle, making the elegant image of the water-drop concept more obvious.
The bottle cap can be made of the same type of glass as the bottle itself, but it can also be made of transparent plastic materials.

Because of the use of regular technical methods to produce, as well as common material [glass] the bottle is easy to produce at a large scale and also easy to recycle, and due to its unique shape, space can be saved during transportation by designing a special package - [two bottles down, one reversed between them]