This seems like a quite common and normal thing, but in fact, there lies a great danger.
Perhaps you have not noticed it before, but if you check the bottom of the bottle, you will notice some of the signs that indicate that the bottle is disposable, otherwise it may be toxic and cancerous.
Bottles that must be thrown after the first use:
Almost all bottles of mineral water, carbonated and non- carbonated drinks that you buy every day, are labeled PET or PETE.
They are intended only for single use. There is a potential danger that with each re- filling with water, the plastic may emit heavy metals like antimony, a chemical compound EPA, which interfere with the action of the hormone. Such bottles can discharge carcinogens.
Bottles that are safe to use:
You will recognize by the marks HDP or HDPE, LDPE and PP or the numbers 2, 4, 5.
LDPE is a type of plastic which unfortunately is not often used for producing bottles, but more for bags for packaging products.
HDP and PP are mainly white, and are used for preparation of cups for yogurt.
Bottles that should be fully avoided:
The plastic ones, labeled with PVC, PS, PC or triangle, within which there are numbers, like 3, 6, 7.
PVC releases dangerous chemicals that interfere with the functioning of hormones in the body. In contrast, this plastic is used for bottle production.
PS emits carcinogenic substance -- styrene. It is most commonly used for making plastic coffee cups or disposable packages for fast food.
PC (or no tags -- no. 7) is the worst plastic for packaging food products because it emits a dangerous chemical BPA. Unfortunately, it is used for baby containers, bottles of athletes and dishes for preparing food.
After these warnings, it is better to check the food and drink containers before use.