Before the development of hand pumped RO filters survival rafts in ships were often fitted with small solar distillers to get minimal drinking water. Due to space limitation and the rocking motion of small survival rafts these were not too popular. On land large salt pans are used to collect salt. However by the simple expedient of covering a water pan sitting in direct sunlight you can capture the evaporated moisture.
A sloped plastic surface above the water works well because the moisture collects on inner surface and as weight of droplets grow they slide down the surface into a catchment gutter that leads the water to a container. the process can be accelerated if you can add more heat from the sun by for example reflecting sunlight with mirrors or have a dark surfqace under the waqter. Cooling the plastic film with air flow across it also lowers the temperature and thus speeds up condensation.
.
