Do you know what the number stands for?
THE NUMBER TELLS YOU THE CHEMICAL MAKE UP OF THE PLASTIC .....
1 Polyethylene terephalate (PET)
2 High density polyethylene (HDPE)
3 Unplasticised polyvinyl chloride (UPVC) or Plasticised polyvinyl chloride (PPVC)
4 Low density polyethylene LDPE
5 Polypropylene (PP)
6 Polystyrene (PS) or Expandable polystyrene (EPS)
7 Other, including nylon and acrylic
What you aren't told is that many of the plastics used are toxic and the chemicals used to create a plastic can leach out of the plastic and into the food / drink.
Think about it, how many times have you or a friend said 'I don't like this, it taste like the plastic bottle ..... '
THAT'S BECAUSE YOU ARE TASTING THE PLASTIC
The WORST ONES are #s: 3, 6, and 7
Check out this chart that breaks down the plastic, its uses and chemical makeup
(I find #7 a little scary)
Reusing plastic bottles by refilling them is NOT a good idea. WATCH THE VIDEO:
Microwaving plastic containers affects the chemical make up of the plastic, allowing the chemical substances to destabilize and leach out more quickly into the food you are reheating. You can check out this article that ran in the Wall Street Journal:
EVEN one of my favorite 'RUMOR DEBUNKING' websites, URBANLEGENDS.ABOUT.COM
Lists the information as: overblown with a grain of TRUTH
READ the FULL 3 pages of the article!
Try to avoid re-using plastic bottles.