A 10 AM Bay Area earthquake is the highest plausibility * severity event you're likely to experience around here on a day to day basis - leaving some people with a 25 mile commute back to a structure that might or might not be standing, intermittent at best communications, and potentially impassible roads. IMO if you don't have a case of water, a road map, and a change of walking-around clothes in your car around her…
I want to leave water in my car, but it gets so hot in there I'm afraid of what is leached into the water from the plastic. I've read a lot of conflicting information about this.
Stuff like BPA is not acutely toxic. There are some concerns about long-term ("subchronic") exposures spanning a decade or more, and even there, there is basically no clear evidence of adverse effects on humans.
Besides, BPA and its ilk are a concern chiefly with a variety of fancier, transparent plastics. Food-grade HDPE and polypropylene jugs are of relatively little concern. They are just not particularly pretty, so they don't sell.
Steel and glass are two other options, although many steel bottles are lined with epoxy or other coatings. Plus, in a car accident, I'd rather have a soft HDPE jug flying around...