4. PC - Poly Carbonate

Once the king of consumer plastics and used for premium variants of products, PC is very expensive, very tough, clear glass like that extremely strong and used as an "unbreakable" alternative to any polystyrene based product. This same plastic is now the main focus of concern of the BPA free debate. What was once popular for Baby bottles and appliances for the upmarket segment and targeted to people who typically spend much more, PC is NOT BPA-free and is typically the villain of choice when it comes to belittling plastics in the food industry. PC is identified with the recycling code 7 at the bottom of products (not all code 7's are PC though). Ironically, the safer BPS based plastics that replaced BPA based polymers used formerly, are also not found to be that much safer either. (Recent articles can be  found on google, search for "BPS not safer than BPA")

These plastics, storage containers, bottles, etc. are usually at a very high price point, and are otherwise EXCELLENT for general storage in the kitchen, like cereal packets, biscuits, etc. but do avoid them for direct food contact (store packaged food only)

GENERAL ADVICE

In spite of what is said above, people generally have an issue with the "plastic smell" that there on foods, liquids stored in plastic over a small period of time. Regardless of what you decide to use, ensure that you regularly clean out your containers, air dry them, and wipe them clean to ensure there is no moisture on the inside. Using good quality air-tight containers that actually work (try a few to see which work better), you should get much better, healthier food stored in your containers/bottles or (in this case), uncontaminated and safe drinking water for regular consumption.  Avoid PET bottles and as a thumb rule stick to Recycling code #5 plastics(PP) or polyesters (Tritan) when it comes to your food storage containers or bottles. With that being followed, I see no reason for concern of any sort of "plastic poisoning" whatsoever.