1. I use filtered water that i fill up in 5-gallon jugs from a vending-type machine. I then use about half of it for the boil, and add the other half to the wort at room temp, without boiling it. And, I have had no issues with contamination. I don't think you would need to worry about bottled water. I would try it first without boiling, that way you will know without going to all the extra work for nothing.
2. I guess with boil over, it depends on how full your pot of wort is, and how closely you watch your wort. If you boiled it, and you did not have a boil-over, then great! there is nothing to worry about. Maybe by gradually bringing to a boil, as opposed to quickly, then you might lessen the chances as well, who knows?
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