One aspect of the present invention is a server for communicating with a medical device. The silicon oxynitride layer can be formed by nitridation of a native oxide layer. A memory controller optionally educates the host on array composition, capabilities and addressing restrictions. The devices are based on the principle of minimum energy interfaces formed between the two fluid phases enclosed inside precise channel geometries. Methods of assessing a sweetness profile of an individual using such kits and customized sweetness delivery systems designed using such methods are also provided.