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Hi, I would recommend WHO pamphlets and guides and of course the redR emergency relief book : Engineering in Emergencies - a practical guide for relief workers by Jan Davis and Robert Lambert ISBN : 1 85339 222 7, which will give you some information on preferred methods. There is also the UNHCR book : Handbook for emergencies. You may be able to develop some training materials from these books.
I hope this helps, Pauline