On web look for Fog/Dew -harvesting, there are couple of ways you can use radiation cooling in the night to harvest clean-water in arid condition. I enclose two references and you could  get more on google search.  (1) This paper is by Girja Sharan, "Harvesting Dew with Radiation Cooled Condensers to Supplement  Drinking Water Supply in Semi-arid Coastal North-west India", International  Journal for Service Learning in Engineering Vol. 6, No. 1, pp. 130-150,  Spring 2011, ISSN 1555-9033.

(2) Maestre-Valero, J. F., Martinez-Alvarez, V., Baille, A., Martín-Górriz, B., & Gallego-Elvira, B. (2011). Comparative analysis of two polyethylene foil materials for dew harvesting in a semi-arid climate. Journal of Hydrology, 410(1), 84-91.