First, you need a reusable bottle. This is your new best friend. It’s like a sidekick, but one that holds 32 ounces of life juice.
Don’t overthink it. A stainless steel one is a tank. It keeps water cold, doesn’t taste like last week’s gym socks, and looks boss on your desk. Or get a glass one if you’re fancy and like a little weight in your bag.
Avoid plastic reusable bottles. I know they’re cheap, but they leach weird stuff. You’re trying to escape plastic, not let it lurk in your bag.