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Frozen Water Can Pass Through Security

The disappointing part about flying is that you're not permitted to bring any liquids through security, leaving you thirsty or spending much-needed cash. Typically, all drinks must be purchased within the airport, which can be very pricey. A clever hack to work around this rule is to freeze your drinks and bring them through the checkpoint while they're still frozen so you can drink them when they are fully melted.

Reddit/JunoNotJune

The fluid restriction applies to liquids, and since this water is frozen, you'll have no issues getting it through security. That means you get to stay hydrated without spending money.