I researched my options and learned that my oldest daughter's metal water bottle was actually aluminum lined with plastic--both potentially toxic. (And really, if you're trying to avoid plastic, what's the point of having a metal bottle that is lined with the stuff?) So I learned quickly that not all metal water bottles are created equal.
In my search for 100% steel water bottles, I found AffirmWater and Klean Kanteen, both available on Amazon. Their prices are similar, so I opted for AffirmWater because I liked the simple, positive messages they carry and I believe in the power of positive thinking. I ended up purchasing five bottles (one for each member of our family), mine being the largest, since I drink the most water. I love that they all had free shipping and came with both types of caps so I didn't have to buy those separately. We know whose is whose by the different words on the outside: Inspired, Gratitude, Love, Peace, and Tread Lightly.
These bottles are heavier than plastic for sure, and much more expensive, but they're very durable, dishwasher safe, and non-toxic. As long as they're not lost, we'll have them for a good long time. And I have peace of mind now: no more BPA--at least, not in our water bottles!
P.S. I also purchased an extra large Klean Kanteen bottle as our extra beverage container for the car, since I didn't see the point of pouring from a plastic container into steel bottles whenever we run out of water on the go...