I'm just too cheap

Because I'm a big ol' cheapskate, I mostly likely won't be spending $13 on a stainless steel water bottle. Instead I went to Trader Joe's and wandered through their beverage aisle until I found one whose container was made of glass, had a recloseable top, and was narrow enough to fit in my cupholder. I think that's the biggest trick to finding a glass bottle that will work for you. Most of them are too wide. But if you're just going to use it around the house, then any old bottle will do. The Snapple ones are good.