Massachusetts-based IPIFINI (the bold is part of the branding) has exceeded our wildest dreams with their Programmable Liquid Container, which contains small, flavor additive-filled (or paint-filled, for the home improvement set) "buttons" around the periphery of the plastic container. Consumers press the appropriate buttons to create different flavors from a common base, such as cherry vanilla cola or raspberry tangerine lemonade, or get even wilder with aroma and food coloring options.
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That is so awesome.