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Fresh water is a basic requirement in the life of living things, especially humans, but the natural conditions with the sea area that dominates the earth make the source of fresh water on the face of the earth very limited. The coastal area and swamp area are areas which in general are very difficult to obtain sources of fresh water. One of the efforts that can be done in overcoming this problem is by treating unsuitable water around it with distillation solar methods. But the main obstacle obtained is the intensity of sunlight that is unstable throughout the day so that the productivity of distilled water becomes unstable. In this study, the effect of the addition of PCM in solar still systems was investigated to increase the productivity of distillate water produced. PCM material is a heat storage material when the intensity of solar radiation is high and will immediately release the heat stored when the radiation intensity decreases. The PCM material used in this study is myristic Acid which is a Saturated Fatty Acid extracted from nutmeg plants which has a melting temperature of around 50 - 60 ˚C, thus this material is very suitable to be used as PCM material in solar distillation systems.