A methodology for customers seeking to purchase a meal from a food service vendor such as a restaurant, a cafeteria, or a vending machine, by ordering a food preparation based upon menu-selections. The disposable portion may include components that come into contact with the fluid, while the reusable portion may include only components that do not come into contact with the fluid. The case is fabricated from an electrically insulative material, such as a liquid crystal polymer material, and is sized and shaped to support or house an electronic device. Said polymers can be used for stabilizing direct or invert emulsions likely to be destabilized or inverted by a modification in the degree of salinity of the aqueous phase or a pH modification. The new BS sector processes the request assigning dedicated resources, e.