http://health.yahoo.net/articles/womens-health/plastic-container-safe
I like this article because a lot of people don't understand the differences between plastics. There are certain containers that are meant to be reused. They are made from heavier plastics - and are great for snacks, leftovers and water/fluids. On the other hand, there are certain plastics - such as many water bottles (think aquafina, dasani, evian, etc.) that are only meant to be used one time. So, while it is good that you are drinking more water, buy a heavy plastic that is dishwasher safe and reusable - these don't breakdown as quickly and are much healthier and environmentally friendly!