wrote in message
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The old saying is "you get what you pay for".
The next time you pull into a gas station to pump up a tire, pass up
the "free air". Go to a station that charges a half buck or more to
get your air. The price is right on the free air, but the air is poor
quality air that will shorten the life of your tires. If you must use
the free air in an emergency, be sure to remove and replace it as soon
as possible afterwards. It's simply not quality air and should not be
used for any length of driving. The rule of thumb is to find the
station that charges the highest price for their air and go there.
The more it costs, the better the air quality.

Nitrogen is the only gas that should be in your tires! ;)

http://www.straightdope.com/columns/070216.html

Bottled water can come from city taps and BS rules.