Frozen liquid items are allowed through the checkpoint as long as they are frozen solid when presented for screening.
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Instant/rapid ice packs that are activated by force—when used for medical/first aid purposes. These items are allowed in carry-on or checked baggage—when carried for medical purposes such as the treatment of sporting injuries.
If your food needs to stay cold, pack it with frozen gel packs, but be careful to pull them out of the freezer the moment before you leave for the airport. Partially melted freezer packs or foods that veer into the liquid territory because they've defrosted will be confiscated.
You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes through the checkpoint.These are limited to 3.4 ounces (100 milliliters) or less per item. This is also known as the 3-1-1 liquids rule.
Tip #2: Reduce waste and save some money by bringing a reusable water bottle. So you can't bring H20 or any other liquids more than 3.4 oz.(well there are some exceptions) through security, but you CAN bring an empty bottle. Just fill it up on your way to boarding your flight after screening.