Everyone knows you can’t carry a bottle of water with you through airport security, but there’s no rule that says you can’t take an empty water bottle with you.
Just pack the empty bottle in your carry-on, and visit a drinking fountain after you pass through security.
You’ll save big bucks by not being forced into airport prices.
For added flavor, bring a packet of powdered drink mix with you. You can pick up a whole box for a buck at any dollar store.
Road tripping? Freeze a couple of water bottles before departure and pack them in your cooler. They’ll keep your drinks cold without a wet mess and when melted, provide more cold liquid refreshment.