Abstract: A method to produce distilled water includes the step of providing a closed-circuit, sealed, pressurized distillation unit. The unit includes a first sealed reservoir to receive and hold distilled water and removably sealingly installed in the distillation unit; a second sealed reservoir to hold contaminated water and removably sealingly installed in the distillation unit; an airstone positioned in the second reservoir to produce at least thousands of tiny bubbles per minute in contaminated water in the second reservoir; a coil positioned above the first reservoir; a cooling system operable to cool the coil; a vacuum pump with an input and an output; and conduit interconnecting the first and second reservoirs.