When the latest warnings about BPA and Nalgene bottles came out I decided to retire the bottles I currently have. I plan on buying a Sigg bottle, but they're not cheap and I haven't gotten around to it yet.
In the mean time, I've gone old school. I brought a couple of cups to the office and bring a travel mug with water into the car. At work I keep the cups in my cabinet and use them as needed for water and tea. I store them in one of my cabinets and wash them out at the end of the day. I use them as needed, wash them out at the end of the day, and keep them in a cabinet.
Since I spend the majority of my time in my car, at work, or at home this works well for me. It keeps me from spending a lot of money on bottled water and saves the resources that go into making plastic bottles.For more frugal and green ideas check out Thrifty Green Thursday.