NOVELTY - The portable water distillation unit comprises a double-bottom evaporation pan/basin, a cover, solar collectors, and a metal frame (2). The evaporation pan/basin is filled with sea water, and comprises an open, upper pan where sea water is to be put and a closed, bottom pan that is defined by the two bottoms. A bottom of the upper evaporation pan forms a top of the double bottom in which hot water circulates and the heat is transferred to the bottom of the evaporation pan and the sea water. The evaporation pan/basin acts as an autonomous unit for production of distilled water and salt.    USE - The portable and stationary distillation unit is useful as an autonomous unit and a sub-unit in system for production of distilled water and salt (all claimed).    ADVANTAGE - The small, portable and stationary distillation unit produces distilled water in an environmental friendly and economical manner with high quality and quantity and without using electrical power, and is easy to install, operate and handle.    DETAILED DESCRIPTION - The portable water distillation unit comprises a double-bottom evaporation pan/basin, a cover, solar collectors, and a metal frame (2). The evaporation pan/basin is filled with sea water, and comprises an open, upper pan where sea water is to be put and a closed, bottom pan that is defined by the two bottoms. A bottom of the upper evaporation pan forms a top of the double bottom in which hot water circulates and the heat is transferred to the bottom of the evaporation pan and the sea water. The evaporation pan/basin acts as an autonomous unit for production of distilled water and salt or as a sub-unit of a production array of an unlimited number of sub-units for producing large quantities of distilled water and salt. A rim of the evaporation pan/basin is constructed to operate as a gutter that is an inverted metal and is positioned and attached around a perimeter of the rim of the evaporation pan, where liquefied vapors of water are caught and carried away by a pipe connected to the fresh water collection tank. The cover placed over the evaporation pan is fabricated with the light, flexible frame covered by a transparent film (1), and a base of the cover is set into the gutter so that drops of the liquefied vapors of water flow down the interior surface of the transparent film into the gutter. The solar collectors are connected by two pipes with a closed, lower double bottom container of the double-bottom evaporation pan. A hot water exit pipe of the solar collector is connected with a hot water entrance pipe of the double bottom, and an exit pipe for cooled water from the double bottom is connected with a water intake pipe of the solar collector. The special construction of the rim of the evaporating pan allows that the base of the cover is positioned within the limits of the rim of the pan and operates as water collector of the water vapors that are created into the space. The cover of the frame is covered with transparent film. An interior surface of the cover traps the water vapors, which then become liquid and flow down in the internal surface of the film into the gutter and into the water collection tank as distilled water. The evaporation pan holds sea water or ripe brine to be evaporated and to produce distilled water and salt. The cover from transparent film material prevents foreign bodies and other pollutants from entering the evaporation pan/basin. The evaporation pan/basin is formed by a depression made in the ground, and is lined with agricultural plastic or with other appropriate material. The metal frame similar to that of greenhouse type is covered with the transparent film, which: operates as the cover for the evaporation pan; bears the gutter positioned internally at a low level around the interior side of the frame for the collection of liquefied water vapors which flow down to the interior surface of the transparent film; and has a strip (4) of transparent film. One edge of transparent film is fastened around the interior of the transparent film cover, and other edge of transparent film is fastened in the gutter so that the droplets of liquefied water vapors flow on the interior surface of the transparent film cover into the gutter. Each of the solar collectors is connected to a pipe, which enters and crosses the bottom of the evaporation pan transferring heat to the sea water in the pan and then returns to the water intake opening of the solar collector. The gutter operates as a collector for the water vapors created inside the space. INDEPENDENT CLAIMS are included for:    (1) a water distillation system; and    (2) a method of operation of water distillation units.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic cross sectional view of a stationary distillation unit.    Transparent film (1)    Frame (2)    Gutter (3)    Strip (4)    Permeable depression in surface of the ground. (5)