We all know that tap water is the least choice for people to drink. Many of us preferred to drink cola, carbonated drinks, juices, and distilled water, which resulted to a large number of empty bottles to be discarded and destined to landfills. To help minimize the growth of landfills, Plus Minus design has created the Just Add Water, a cap with embedded gelatin-based liquid tab that adds flavor to the water as it dissolves the moment it gets contact with the water. The cap are designed to fit on almost all types of plastic water bottles and can be recycled by the time its useful value has ended.
Source: Plus Minus Design via The Design Blog