The NHS recommends drinking up to eight glasses of water a day to stay hydrated. And if you're drinking alcohol, it's even more important to top up on water.
Not every hospitality business has to provide free tap water, although the recent drive towards reducing plastic use means more and more will let you refill a water bottle regardless of whether you are a customer are not.
The rules for pubs are clear, they have to provide customers with free tap water due to the Licensing Act. But unlicensed businesses, such as cafes or restaurants that don't sell alcohol, are not subject to the same rules.
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Do restaurants, cafes, pubs and clubs have to provide free tap water to customers?
The only law that forces businesses to provide free tap water applies to licensed premises. Pubs, bars, cafes, restaurants and nightclubs must provide free tap water if they sell alcohol, under the Licensing Act.
The terms of the Licensing Act state: "The responsible person (the licence holder) shall ensure that free tap water is provided on request to customers where it is reasonably available."
The law only applies to customers, so a pub could refuse to provide tap water to somebody who has not bought any drinks or food at all.
If a venue does not hold an alcohol licence, they are not obliged to provide free tap water. However, many still do for paying customers, at their discretion.
Can pubs, restaurants, cafes and clubs impose a service charge for 'free' tap water?
While free water must be provided to customers in licensed businesses, there is a 'grey area'. There is nothing in the Licensing Act to stop hospitality businesses from slapping a surcharge for service, glass use or filtering - although not many do if you are a paying customer, The Consumer Council for Water told MoneySavingExpert.
Where can I get free tap water to fill up my reusable bottle?
Businesses across Britain have signed up to a scheme promising to refill water bottles for free. Nationwide chains include Starbucks, Pret, Costa, Iceland, Morrisons, JD Wetherspoon, Premier Inn, Greggs, Lush. Independent businesses have signed up too.
You can spot them by either looking for the blue and white Refill window stickers, or entering a location into Refill's app.
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