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Why not tell your training course participants that they could buy ready made "WaterCone" solar stills off-the-shelf? see I haven't used one myself yet, but they look lightweight, portable, and ideal for use in emergencies if you have a large number of batteries to be topped up with distilled water. Drinking distilled water, as you know, is not the best option as it is lacking essential minerals found in surface or groundwater, and can have an adverse effect on the body (something to do with osmosis).

VITA have plans on the internet for building a simple solar still, see Bilal A. Akash, Mousa S. Mohsen and Waleed Nayfeh Renewable Energy Research Centre, Department of Mechanical and Industrial Engineering, Applied Science University, Amman 11931, Jordan This paper presents experimental results obtained using the basin type solar still. The experiments were conducted in Jordan using a solar still with various cover tilt angles of 15, 25, 35, 45 and 55°.

An optimum tilt angle for water production was found to be 35° during the month of May. Salt was added to study the effect of the salinity of water on solar distillation. Distilled water production decreased with salinity. The effect of water depth was also studied. The results show that water production decreased in a somewhat linear relationship with increasing water depth in the still. Maybe you could try getting hold of a copy of that article? See also the Journal Desalination ISSN 0011-9164 1993, vol. 94, no1, pp. 55-68 (11 ref.) "Optimum conditions for a solar still and its use for a greenhouse using the nutrient film technique"

At the following website is a design for a DIY solar still about 1m by 1m in size

About 2 or 3 feet in diameter is adequate for a small quantity of water for batteries for a solar power system or for a single family if they really have no other, better, source of water (see for example it's not a reader-friendly site though!)

Trish Morrow