Shoppers looking for zero sugar
If 0g sugars is your deciding condition, check the exact drink’s per-100ml panel. Plain soda water and some slimline tonics meet that condition, while a reduced-calorie tonic need not.
Who is each mixer for?
Tonic drinkers checking sweeteners
If you want tonic flavour but avoid a particular sweetener, read the ingredients as well as the sugar figure. Schweppes Slimline and Sainsbury’s Diet Indian Tonic list different sweetener combinations.
Shoppers planning a few serves
Match cans or bottles to how many drinks you expect to make. Sainsbury’s says its 1L Diet Indian Tonic should be refrigerated after opening and used within three days.
What should you check before choosing?
Start with the sugar figure and flavour you want, then check sweeteners and whether the pack size fits the evening.
| Priority | What to check | Your needs |
|---|---|---|
| Sugar and calories | Compare sugars and energy per 100ml on the exact product. Fentimans lists its Soda Water at 0g sugar and 0 kcal; its Naturally Light Tonic lists 3.4g sugar and 18 kcal per 100ml. | I want to know whether a drink actually has zero sugar, rather than relying on “diet” or “light” in its name. |
| Flavour | Decide whether you want plain soda water, quinine tonic or a botanical tonic. Check the sugar panel separately from flavour descriptions. | For this TV-night drink, tonic bitterness might matter more to me than a plain mixer—or I may prefer to leave tonic flavour out. |
| Sweeteners | Read the ingredients on the chosen variant. Tesco Groceries lists aspartame and acesulfame K in Schweppes Slimline; Sainsbury’s lists acesulfame K and sucralose in its Diet Indian Tonic. | I want to recognise the sweeteners in my drink and check phenylalanine wording if aspartame matters to me. |
| Pack and storage | Compare the serving size and number of cans with the bottle size. For Sainsbury’s Diet Indian Tonic 1L, follow its instruction to refrigerate after opening and use within three days. | A few separate cans may fit an occasional evening; a larger bottle makes more sense if I expect to use it within the time stated on its label. |
Common buying mistakes
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Treating “light”, “diet” and “zero sugar” as interchangeable
Fentimans lists 3.4g sugar per 100ml in Naturally Light Tonic, while Fever-Tree’s Refreshingly Light Indian Tonic includes fructose. Neither name alone establishes a zero-sugar drink.
For a zero-sugar choice, check that the exact nutrition panel states 0g sugars.
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Overlooking the sweetener ingredients
Tesco Groceries lists aspartame and acesulfame K in Schweppes Slimline; Sainsbury’s lists acesulfame K and sucralose in its Diet Indian Tonic.
Read the chosen pack’s ingredient list. GOV.UK says drinks containing aspartame require wording about a source of phenylalanine.
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Choosing a large bottle for one drink
Sainsbury’s instructs shoppers to refrigerate its opened 1L Diet Indian Tonic and use it within three days.
Compare the bottle with smaller cans if you expect only one or two serves.
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Using a sugar claim to judge caffeine content
Sugar and caffeine are separate label checks. A caffeine-free cola is also a different sort of drink from tonic or soda water.
If you want cola for the evening and caffeine matters to you, check for both “caffeine free” and the sugar information on the exact product.
Brand and retailer references
Fever-Tree
Refreshingly Light Indian Tonic is a reduced-calorie tonic option for shoppers who still want tonic flavour.
- Fever-Tree says it has 50% fewer calories than its regular Indian Tonic.
- Its ingredients include fructose, so do not treat “light” as a zero-sugar claim.
Schweppes
Slimline Tonic is a quinine-tonic option when the sugar figure matters.
- Tesco Groceries lists the Slimline Tonic at 0g sugars and 2 kcal per 100ml.
- The listed recipe contains aspartame and acesulfame K and identifies a source of phenylalanine.
Fentimans
Its Soda Water and Naturally Light Tonic serve different flavour and sugar preferences.
- Fentimans lists its Soda Water at 0 kcal and 0g sugar per 100ml, without artificial sweeteners.
- Its Naturally Light Tonic lists 18 kcal and 3.4g sugar per 100ml; choose it for tonic flavour, not a zero-sugar requirement.
Sainsbury’s
Its Diet Indian Tonic Water is a 1L low-calorie tonic option.
- Sainsbury’s lists 2 kcal and less than 0.5g sugars per 100ml.
- It contains acesulfame K and sucralose; refrigerate after opening and use within three days.
Tesco
Tesco lists its own-label Low Calorie Indian Tonic Water in a 1L bottle.
- Its tonic range also includes low-calorie flavoured variants.
- Check the exact pack’s sugars and sweeteners before choosing it for a zero-sugar drink.
Britvic
Pepsi MAX Caffeine Free is a cola alternative if the evening drink does not need to be a mixer.
- Britvic describes a caffeine-free option in its Pepsi MAX range.
- Cola will not provide the plain taste of soda water or the quinine flavour of tonic.
Joybuy drinks for a TV night
These options include slimline and light tonics, plus a lemon-and-lime drink that can also be used as a mixer. Check each product’s sugar information rather than assuming the names describe the same kind of drink.
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Schweppes Slimline Tonic Water 12 × 150ml
For separate tonic serves when you want 0g sugars: the Joybuy nutrition information lists 0g sugars and 2 kcal per 100ml. The listed ingredients include aspartame, and the product identifies a source of phenylalanine.
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Fever-Tree Refreshingly Light Premium Indian Tonic Water 15 × 150ml
The 150ml cans suit individual tonic serves. Fever-Tree describes Refreshingly Light Indian Tonic as reduced in calories compared with its regular Indian Tonic, but its ingredients include fructose; choose it only if zero sugar is not your requirement.
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Fever-Tree Refreshingly Light Mediterranean Tonic Water 8 × 150ml
An eight-can option if you want Mediterranean tonic for several separate serves. Do not infer zero sugar from “Refreshingly Light”; check the exact variant’s nutrition and ingredients before buying.
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7UP Zero 24 × 330ml
A lemon-and-lime drink to consider if tonic flavour is not essential; the product description also presents it for use as a mixer. This is a 24-can multipack, so consider whether that quantity suits your plans.
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Double Dutch Skinny Tonic 24 × 200ml
The 200ml cans provide separate tonic serves, but the product’s “Skinny” name is not a zero-sugar claim. Check the pack’s sugars and energy information if either determines your choice.
Frequently asked questions
Is a “diet” or “light” mixer always zero sugar?
No. Tesco Groceries lists Schweppes Slimline at 0g sugars per 100ml, but Sainsbury’s lists its Diet Indian Tonic at less than 0.5g, and Fentimans lists Naturally Light Tonic at 3.4g per 100ml. Check the nutrition panel for the exact drink.
What should I check if I avoid aspartame?
Read the ingredients and phenylalanine wording on the chosen pack. Tesco Groceries lists aspartame in Schweppes Slimline Tonic and identifies a source of phenylalanine; GOV.UK sets out the related labelling warning for products containing aspartame.
What if I want a mixer without artificial sweeteners?
Fentimans lists its Soda Water at 0g sugar and 0 kcal per 100ml, with no artificial sweeteners. It is plain soda water rather than a tonic, so it will not provide tonic’s quinine flavour.
How should I keep an opened 1L diet tonic?
Follow the instruction on the exact bottle. Sainsbury’s says to refrigerate its Diet Indian Tonic Water after opening and use it within three days.
Can I choose a caffeine-free drink for a TV night?
Yes, if a cola rather than a tonic or soda mixer suits your plans. Britvic describes Pepsi MAX Caffeine Free as a caffeine-free cola option; check both caffeine and sugar information on the exact drink you choose.