Join Date: Jul 2002
Location: Outside the box
If you have a flimsy bottle it can crease if handled harshly and become microscopically damaged, you might see the edges turning white where they were once clear. Some say this damaged plastic can now leach out more chemicals in the water. Usually the still water bottles can be thin walled and are the ones to watch for, if you are concerned.
If you have a commercial water bottle which you bought empty it should be OK as it will not get these creases, and many brands of water or soft drinks will have decent strong bottles. Sometimes you can get really good ones with beer in off licences since in some countries they resuse the PET bottles, so they are extra strong.
Some do worry about a chemical, BPA, in some bottles though, nothing to do with reusing bottles. Baby bottles and some one use bottles could have this chemical.
Freezing bottles can cause the plastic to stretch and go a bit white in a similar way.
I am not saying any of the above is something to worry about, its just what I have heard before. I don't worry about it myself, I am sure I am ingesting far worse things! I would sooner drink tap water over bottled water too.
Bacteria is the bigger definite worry as many people do not bother properly washing & disinfecting water bottles as "they only had water in them".