According to the WHO guidlines, you can prepare powdered formula with "safe"
water without boiling if it is fed immediately after preparation.  This is
the handout we give to all our moms in their teaching packet below, and that
info is given on the last page.  We do not encourage that method.
 
http://www.who.int/foodsafety/publications/micro/pif2007/en/
 
Linda Anderegg, BSN, RNC, IBCLC in Chicago

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