This a 2 part question.  1. ...

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This a 2 part question.  1. how do you know you can collect enough for your needs?  2. How to purify this water? There are sufficient old and not so current ways to purify. Baby steps for now. Your water in Gallons + 1. all your raised surface areas, measure S/F X 144 = S/In. 2 check annual rainfall your area. 3. Square inches x annual rainfall = cubic inches of water possible. 4. divide this total by 1,728 = cubic feet. Times 8 (gl /q/f)= total gallons collectable.  Find out your estimated uses subtract from possible total. If short add more flat surfaces and or use less/recycle more.  quick e.g.  HS 60x80=4800 S/F x 144 = 691,200 c/In. X Annual rain = 30 In. total = 20,736,000 C/In. Divide by 1728 = 12,000 C/F X 8 (gl) = 96,000 gallons per year. roof, barrel, pipe, cistern, pump, elec, , microbial purification pennies a month.  While you are at it you might as well get a bio digester with a bio generator attached. process all your waste, and collect electricity for home use. OTG, simple as can be!