Water bottles are a dime a dozen these days. OK, maybe a bit pricier, but the point is there are bunches of them. Avex still manages to stand out with their Brazos bottles, available in 25 and 32 ounce capacities. BPA-free, but of course.
The 32oz is 3.5 inches by 10 inches, tapered at the top to fit any hand, and should fit most modern cup holders made for us supersized Americans. Beyond that basic requirement, we only ask one thing of our bottles: don't leak, and the Brazos is apparently bombproof in that regard. When you do want liquid out, it's entirely a one-handed operation: just flick open the dust cover and press the button with your same-hand finger.
The Brazos is top-rack dishwasher safe, and its tank-tough construction should give many years of service. It doesn't hurt that the price is reasonable to boot.