Taking a refillable water bottle through an airport

Check the security rules for every airport on your route before packing a refillable bottle. Plan for the empty container at the checkpoint and for refilling after the relevant check. Permission to carry water inside the bottle needs a separate check.

Empty bottles and liquid limits

TSA permits empty water bottles in carry-on and checked bags; the officer makes the final checkpoint decision. These are US rules. TSA's empty-bottle entry.

For ordinary carry-on liquids, TSA states a limit of 3.4 ounces, or 100 millilitres, per container in a quart-sized bag. TSA's page lists exemptions for medications and infant or child nourishment. Read the relevant exemption instructions if you need them for your trip; do not treat ordinary drinking water as exempt. TSA's liquids rule.

Empty the bottle before approaching the checkpoint and keep it accessible for inspection. This packing step does not guarantee admission. Do not treat a retailer's travel label as permission from the security authority.

Check departure, transfer and return rules

UK government guidance says liquid rules depend on the airport and directs travelers to check departure, onward and return airports. It says most UK airports limit liquid containers to 100 mL, including when the container is only partly filled, while some allow containers up to two litres. The UK liquids overview.

When checked on 14 October 2026, Heathrow's security page allowed liquid containers up to two litres but required metal and insulated bottles to be emptied before security. The page says those bottles can be refilled after security. Heathrow's security instructions.

Record each authority's guidance and the date you checked it for the departure and transfer airports, including the return journey. Recheck if your itinerary changes. These examples were checked on 14 October 2026; confirm the rules for your travel date.

For a hypothetical trip from Heathrow with another security check elsewhere, plan what to do with the bottle before that later screening point. Check the connection's instructions; the Heathrow allowance applies at Heathrow.

Find a refill point

Heathrow's facilities page links to its water-fountain map and says travelers are welcome to fill bottles at the fountains. Heathrow's fountain information can help you locate one in your terminal. The map is a planning aid; this article has not checked whether a particular fountain is operating today.

Look for official facilities pages for the other airports on your route. At the terminal, follow drinking-water signs and ask staff if a listed point is unavailable. Keep an alternative drinking-water plan in case you cannot use the mapped point.

If you are continuing into London, our London water guide is a starting point for accommodation questions, alongside current local information. Neither a security allowance nor a general city guide certifies an individual airport tap. Check the instructions at the refill point before using it.