For a strict no-added-sugar requirement, choose soda water whose ingredient list contains no food added for sweetening; Fentimans Soda Water, for example, lists carbonated water, salt and sodium bicarbonate, with 0g sugar per 100ml. Choose a light tonic for its tonic flavour only if you accept its specific recipe: Fever-Tree Refreshingly Light lists fructose, while Fentimans Naturally Light lists sugar. For replacing fluid lost through exercise, the NHS recommends water.
If the claim matters more than tonic flavour, start with an unsweetened soda water and check the exact pack. Fentimans lists only carbonated water, salt and sodium bicarbonate for its Soda Water, alongside 0g sugar per 100ml.
A light tonic may suit you if its quinine and botanical flavour matters more than avoiding added sugar. Check the recipe: Fever-Tree Refreshingly Light Indian Tonic lists fructose, and Fentimans Naturally Light Tonic lists sugar.
Carry water for replacing fluid lost through activity, as the NHS advises. A fizzy mixer can be a separate drink with your snacks if you like its flavour and the pack suits your bag.
Decide whether no added sugar is a firm requirement or whether you would accept a sweetened tonic for its flavour. Then check the exact recipe and pack format.
| Priority | What to check | Your needs |
|---|---|---|
| No added sugar | Read the claim and ingredients for the exact product. The Advertising Standards Authority explains that a no-added-sugar claim in Great Britain excludes added sugars and other foods used for sweetening; “light” is not the same claim. | I want to avoid added sugar, not just pick a drink described as light. |
| Recipe and nutrition | Compare ingredients and sugars per 100ml. Fentimans lists 0g sugar per 100ml for its Soda Water but 3.4g per 100ml for its Naturally Light Tonic; Fever-Tree lists fructose in its Refreshingly Light Indian Tonic. | Tonic flavour appeals to me, but I want to know what is in the particular variant before it goes in my bag. |
| Exercise drinks | Plan separately for the workout and the snack break. The NHS recommends water for replacing fluids lost through physical activity. | Water will be my main workout drink; I might want something fizzy with food afterwards. |
| Pack format | Check the stated serving size, the number of drinks and whether the container closes securely enough for your bag. Confirm the ingredients on the format you intend to buy. | A smaller drink may be easier to take with my snacks, while a bottle needs a closure I can trust in my bag. |
Light tonic can still contain sweetening ingredients. Fever-Tree Refreshingly Light Indian Tonic lists fructose, and Fentimans Naturally Light Tonic lists sugar.
If no added sugar is essential, check the exact ingredient list rather than relying on “light”, “slimline” or “no artificial sweeteners”.
Tonic brings a different flavour from soda water, but a tonic name does not establish that its recipe meets a no-added-sugar requirement.
Start with plain soda water if avoiding added sugar is decisive. Choose tonic only after checking and accepting the sugar status of its exact variant.
A fizzy drink with snacks is a different choice from replacing fluid lost during exercise. The NHS recommends water for that purpose.
Pack water for the activity itself and choose a mixer separately if you want one with your snacks.
A mixer category can contain soda water alongside standard and low-calorie tonics. Their names and recipes do not establish the same sugar status.
Use the listing to identify candidates, then read the ingredients and nutrition panel for the exact product you intend to buy.
Its Soda Water and Naturally Light Tonic illustrate why the exact drink matters more than the brand name when avoiding added sugar.
Its regular and Refreshingly Light Indian Tonic recipes are relevant when comparing tonic flavour with a strict sugar requirement.
Tesco Groceries lists own-label soda water, low-calorie Indian tonic and standard Indian tonic as separate products.
Tesco Groceries lists Schweppes Tonic Water and Schweppes Slimline Tonic Water separately.
Britvic described Classic and Low Calorie Indian Tonic variants in a 2021 trade announcement.
These options cover a 330ml soft drink and 500ml sparkling water for taking with snacks. If no added sugar is essential, check the ingredients and nutrition panel on the exact pack before choosing.
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The 330ml format gives you an individual drink to take with snacks, in a pack of 24. If you want an unsweetened mixer rather than a flavoured soft drink, check the exact ingredients before buying.
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This sparkling-water option comes in eight 500ml bottles. Check the closure before carrying a bottle in your bag, and confirm the current ingredients and nutrition panel if no added sugar is essential.
No. Fever-Tree Refreshingly Light Indian Tonic lists fructose, while Fentimans Naturally Light Tonic lists sugar and 3.4g sugars per 100ml. Read the ingredients of the exact tonic rather than treating “light” as a no-added-sugar claim.
Start with an unsweetened soda water and confirm its ingredients. Fentimans Soda Water lists carbonated water, salt and sodium bicarbonate, with 0g sugar per 100ml according to Fentimans; check the label of whichever product you buy.
Make water your main choice for replacing fluid lost through exercise: that is the NHS recommendation. A mixer can be a separate fizzy drink with your snacks, but its flavour or sugar claim does not make it a dedicated workout drink.
Choose a format you can carry and expect to use. Check that a bottle closes securely before putting it in your bag, and read the label on the exact pack if its ingredients matter to your choice.