Check on the bottom of the bottle there is a triangle sign and there will be a number on it.

 

If the number is higher than or equal to 5 --> then this bottle is safe to use.



Whatever number under 5, will release the chemical. For most bottle water, the number is 1.

 

Did you know chemical released by plastic water bottles can cause cancer

(It is not the water that affecting you but the chemical releasing from the bottle)