From crisp G&Ts to fizzy cocktail spritzes, tonic water is one of the most iconic mixers out there. It’s the secret to a perfectly balanced serve and plays a leading role in one of the world’s favourite drinks: the classic Beefeater Gin & Tonic.
But what exactly is tonic water? Where did it come from? And are all tonic waters created equal?
Whether you’re mixing a highball at home or brushing up for International Gin & Tonic Day, here’s everything you need to know about this fizzy staple.
Tonic water is a carbonated soft drink with a slightly bitter flavour, usually made with water, sugar, and quinine. Quinine is an ingredient extracted from the bark of the cinchona tree, which gives tonic its signature bitter edge. Originally added for medicinal reasons, quinine became the reason G&Ts came to be.
Today, most tonic waters also include flavourings like citrus, herbs or botanicals to round out the taste. That light bitterness is what makes it such a great partner to the bold, juniper-forward flavour of Beefeater London Dry Gin.
The history of tonic water goes hand in hand with the rise of the Gin & Tonic. British officers stationed in India during the 19th century used quinine to help fend off malaria. But quinine on its own was notoriously unpleasant to drink, so they added water, sugar and gin to make it more palatable. The result? A G&T that became an instant classic.
You can read more about the story behind the serve in our blog on the history of the Gin & Tonic.
Not all tonics are the same. From classic options to bold infusions, there’s a growing range of tonic waters to suit every flavour profile. Here are a few popular types:
The standard choice for most gin cocktails. It has a balanced mix of quinine bitterness and subtle citrus. Pairs best with traditional gins like Beefeater London Dry.
Made with less sugar or alternative sweeteners, these are a go-to for those after a lighter option. Still fizzy and flavourful, and perfect for easy daytime sipping.
Think cucumber, elderflower, Mediterranean herbs or even pink grapefruit. Flavoured tonics bring extra personality to your serve and work brilliantly with flavoured gins like Beefeater Pink Strawberry.
Infused with aromatics like rosemary, thyme, or spices. These tonics complement complex gins or cocktails with herbal and savoury notes. Ideal if you’re after a more layered, adventurous G&T.
Concentrated syrup versions of tonic water are also available. Just add soda water to control strength and sweetness. Great for bartenders or home cocktail creators who want more control over their mix.
Tonic water does contain quinine, which was historically used as a medicine. But the amount in today’s drinks is tiny and used for flavour, not health. Some tonic waters can be high in sugar, although there are low-calorie options available.
The key thing is to enjoy it in moderation and focus on the taste experience. It’s all about balance—both in flavour and in how you enjoy your drink.
Tonic water is best known for its starring role in a G&T, but it’s also great in other fizzy cocktails. It adds lift, texture, and just the right amount of bitterness to balance out bold or sweet spirits.
A few ways to use it:
And for even more ideas, check out our guide to tonic vs soda water to help decide what works best with your chosen gin.
Tonic water is more than just a mixer—it’s a key ingredient that brings out the best in your gin. With so many types of tonic water available, you can customise your drink to suit your taste and the moment. Whether you’re going classic with Beefeater London Dry or getting playful with flavoured gins and tonics, there’s a perfect pairing for every mood.
Want more G&T inspiration? Don’t miss our roundup for International Gin & Tonic Day or check out our full collection of classic Beefeater Gin cocktails.
