What type of roof is safe to collect rain water?..To Drink.?

Question by zuma: What type of roof is safe to collect rain water?..To Drink.?
Asphault Shingles has asbestos, or lead, anti fungus agents?..Galvalume,...Galvanize is Safe?
Painted.. R -Panels is Lead Base Paint?.. or does it matter(lead base paint).
There is no Acid Rain where I live.

Algae,..Never hurt my ancestors/ gran parents,..i remember washing clean the cistern, twice a year.

Filter, no problem
The type of Roof?..I live in zone 9, we don't have industry, never did,..the whole

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