There is a great site where I bought my daughter a water bottle to use at school called Reusable Bags:
http://reusablebags.com/
They sell SIGG water bottles with sippy attachments (the sippy part is a safe plastic and the part the liquid sits in is stainless steel, which is safe.
There's another kind they sell, called Kleen Kanteen. Not sure if they have sippy attachments or not.
I will say if you get a SIGG, definitely buy the handles or an insulated sleeve- they get VERY cold to the touch when you have a cold drink in them! (Which is good- your drink stays cool!)
Also, for later, you might want to remember that most lunchboxes are made of bad plastics or vinyl which contains lead. This site is good for finding lunchboxes too, or we bought my daughter one from Hannah Anderson that is safe.
These things ARE pricier, but I think it's worth it for the peace of mind.
Amanda