We just had this discussion in a school group awhile back....here are some of the notes that I had kept......
  Myths about Dioxins and Freezing Plastic Water bottles 
I have heard that 
THESE were good....I heard that Target carried them, as well.  
And a friend only uses 
Kleen Kanteen stainless steel water bottles  - I believe she bought them at our natural (whole foods) store.  
"According to the news 

 the water bottles that you 'are not supposed to
reuse' are numbered 3, 6, or 7 in the recycle triangle. We went through all
of ours & we had none with those numbers.The did have shampoo bottles with
those numbers. I have found the water bottles that the Special K Protein
water comes in to be wonderful! I purchased a bunch of the water at a
scratch & dent grocery store for almost nothing (yeah!). They are heavy
duty & wash well in the dishwasher. They are similar to the Lifewater
bottles, only a little slimmer. "  
Gardenaut: BPA-Free Water Bottle Showdown  Walmart.com: Thermos - Foogo Straw Bottle, Pink, BPA Free: Feeding 
**I did notice that Wal-Mart had water bottles made by PUR (that makes water filters)...these bottles were back by the hardware section, by the water filters**