Aeration, no. The only time you need to worry about this is after fermentation is started. Theres a lot of talk about hot side aeration, but as long as you don't do a TON of splashing, you'll be fine. I've never had a problem and I don't use pumps.
As for bottled water, I would think you'd be fine, but I don't know a whole lot about the chemistry side of brewing. I have good tap water, so I always come out at around 5.2-5.4 pH after my mash.
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