Just FYI: all plastic bottles will "out-gas" fumes from the plastic if they are stored airtight.
Remember to wash the bottle out with soap and hot water when you first buy it, and flush the filter thoroughly by running 3-4 bottles of water through it before you start drinking from it.
The best way to store these is to disassemble the cap, drop the filter and the spout into the bottle, then screw on the wide part of the cap. Air will be able to get out of the bottle while it is stored, but you will not lose the parts. I haven't had difficulty with that plastic taste since I started storing mine without the closed cap.