Personally, I use glass, as much for the taste as for peace of mind about potential chemical leaching. Stainless steel is probably second best in terms of safet

Personally, I use glass, as much for the taste as for peace of mind about potential chemical leaching. Stainless steel is probably second best in terms of safety as long as you make sure that the inside is not lined with plastic or some other coating (it happens) and that it is from a reputable manufacturer and certified free heavy metals or other metals that are not good to ingest. Here are the bottles I've been using for about a year and a half: http://amazon.com/Aquasana-AQ-6005-18-Ounce-Bottles-6-Pack/dp/B003XPISEO http://amazon.com/Aquasana-AQ-6005-18-Ounce-Bottles-6-Pack/d... All glass with a BPA-free plastic top. They're great, but I have broken two of them, which is of course the major downside of glass bottles.