GLASS is best to drink and eat out of, and should always be first choice, I can't emphasize this ENOUGH!. There is much confusing info. out there on Plastics. I think it is wonderful for those who are proactive in researching if that is your inclination. I have to tell you though... that one will "ALWAYS" find conflicting, confusing, and controversial info. on the WEB about every single thing from A to Z.
Another words, you will find if you look long enough, hard enough and deep enough.....you will definitely find BAD and GOOD info. on everything you look up, everything.
So everyone I know who loves research including me runs into finding lots of conflicting info. and it can drive one insane! Not to mention the fact that things we think are good.... perhaps a couple of decades down the road, we will find out are bad, so we go round and round and round with whats good and whats bad. What does your intuition tell you? Your sixth sense tell you? Sometimes its good to go inside and feel the answers.
I strongly advise against plastic, Period! GLASS should be first choice, then stainless.
However, there are those though that still insist on using plastic anyway and I still think 7 is better than "1" but that is what I personally deduced from all the conflicting info. out there.
I recommend just using glass as I do and then be at "peace" once and for all about drinking out of plastic! Yes, plastic has its benefits in some ways in this world, but in general I think it is dangerous to our overall health and environment, in so many ways, and should be avoided where possible when it comes to food and drink.
So save yourself the torment and time of research and use glass or stainless steel, and then you dont ever have to worry again about drinking out of plastic.
All bottled water in stores is plastic grade number 1 or 2 , look at the bottom of water bottles, there is a number in a triangle box, look closely. Number 7 plastic is the only grade you should be drinking out of, even so, its still not as safe as glass. Then you fill them up from your filtered water at home. Best to have your very own high end filtered water system or buy water from a water company, insist or find a water company that has # (7) grade plastic. Bottled water in stores is not good at all because the grade of plastic is really dangerous, usually just a (1) and the plastic absolutely does migrate into the water, not to mention what it does to our planet. Only drink bottled water from stores if there is no other alternative at the moment! Look for glass or pure stainless steel to bring in car. Its very dangerous to be drinking water out of plastic when its been sitting in the car , in the heat or sun. Even if you use number 7 keep out of the sun and heat. I only use glass in my car. I save and keep empty glass juice bottles and use those for my car. There is no comparison drinking and eating from glass compared to plastic. I would just simply give up the plastic!