Years ago people who were not on mains water would collect rain water in a covered tank and drink it with no problems, though I guess they probably boiled it first. These days we are less exposed to bugs and no longer have so much immunity.
Then why all the charity ads on TV, appealing for money to provide 3rd world countries with a clean bug free water supply?
It is the OP's choice, but if he had already decided then why come on here asking if it would be safe to use? We have moved on a long way from scooping our drinking water from puddles.