Don't leave plastic water bottles on concrete floors

[snopes]

Comment: I heard on the radio (KNX, AM 1070 in Los Angeles) that water
stored in plastic for use after an earthquake should not be left on a
concrete floor. I found this on the web
(http://faculty.deanza.edu/donahuemar...earthquake):DO
NOT STORE ANY PLASTIC WATER CONTAINER DIRECTLY ON CONCRETE. The concrete
will leech chemicals into the water, contaminating it. Concrete will also
degrade the plastic bottle causing failure." attributing that statement to
the "LA FIRE website." But I could not find that on the lafd.org website.
Is this the same as the myth about leaving an automobile battery on the
garage floor?

[Skeptic]

I went camping last week at a remote bush area. Recent storms had damage the water tank so we had to drink water from plastic bottles that had been there since the last visit a year previously. Despite being on concrete, the bottle were fine and the water tasted ok.