700ml Smartwater ($2) at the nearest gas station. It has a nice spigot on it that makes it easy to drink on the go and weighs nothing. Feels good to keep something for a long time that was once meant to be easily disposable, which I think is what we all really appreciate in BIFY.

Pro tip: rub a little goo gone on it after you take off the label sticker.

I’ve had mine since 2018 and i bring it everywhere!