A premium mixer can be an optional drink alongside a pre-workout snack, but its flavour or sugar content does not make it a substitute for planned food. Choose water for hydration, consider food separately according to when and how you exercise, and compare a mixer’s per-100 ml label and serving size if you want a sparkling drink. Keep it alcohol-free before exercise.
If tonic or botanical flavours appeal, treat the mixer as a drink alongside food rather than the food itself. University College London Hospitals NHS Foundation Trust describes pre-exercise snack choices in terms of timing and activity; the NHS recommends water to replace fluid lost through physical activity.
Check sugars and energy per 100 ml, then consider how much you will pour or drink. A light tonic is not necessarily sugar-free, and a fruit-led mixer can have a different nutrition profile from a tonic.
Do not choose a mixer by flavour or a “light” label in place of that plan. University College London Hospitals NHS Foundation Trust notes that snack timing and carbohydrate needs can vary with diabetes management, activity type and duration.
Decide what you need from food and fluids before choosing a mixer for its flavour. Then compare drinks using the same label measure and your intended serving size.
| Priority | What to check | Your needs |
|---|---|---|
| Food before exercise | Consider the time until exercise and whether a separate snack is needed. University College London Hospitals NHS Foundation Trust describes carbohydrate and protein in snacks eaten 60–90 minutes beforehand, with different considerations closer to activity. | I want something to eat before training, not just a flavoured drink. If I follow an individual glucose-management plan, that plan determines my food and drink choices. |
| Sugar and serving size | Compare sugars and energy per 100 ml, then check the can, bottle or glass size. Fentimans lists 3.4 g sugars per 100 ml for Naturally Light Tonic Water and 7.9 g per 100 ml for Mandarin & Seville Orange Jigger; these are different drinks, not matched pack sizes. | I would like a sparkling drink whose stated sugar content fits my preference. The word “light” alone does not tell me how much is in the portion I will have. |
| Hydration and alcohol | Keep water available, particularly for longer activity or exercise in heat. The NHS recommends water for replacing fluid lost through physical activity; GOV.UK’s heat-illness guidance advises water before, during and after exercise in heat and says to avoid alcohol before exercise. | When hydration is my main concern, I will use water rather than rely on a tonic. Any mixer I have before exercise will be alcohol-free. |
| Ingredients and label | Read the exact product’s ingredients, nutrition declaration and allergen information. Fever-Tree and Fentimans identify quinine in the tonics described here; formulations and pack sizes can differ. | I want to know what is in the particular drink I am buying, especially if an ingredient or allergen matters to me. |
A drink containing carbohydrate is not automatically the food needed before a particular session. University College London Hospitals NHS Foundation Trust links snack composition and timing to the activity and the person’s circumstances.
Plan food separately if you need a snack; choose a mixer only as an optional drink alongside it.
Fentimans lists 3.4 g sugars per 100 ml for Naturally Light Tonic Water, while the Joybuy listing for Fever-Tree Refreshingly Light Premium Indian Tonic Water lists 3.8 g per 100 ml.
Compare the current pack’s per-100 ml figures and the amount you intend to drink.
A fruit-led name does not establish whether a drink suits pre-exercise food needs. Fentimans lists 7.9 g sugars and 8.9 g carbohydrate per 100 ml for Mandarin & Seville Orange Jigger; those figures alone do not describe a complete snack.
Choose it for the flavour if that is what you want, while making any food decision separately.
GOV.UK’s heat-illness guidance advises avoiding alcohol before exercise.
Serve tonic or another mixer without alcohol before training, and keep water available for hydration.
These brand ranges illustrate different tonic formats and label details; a brand name alone does not establish the nutrition of an individual drink.
Its UK range includes standard and Refreshingly Light Indian tonic waters alongside other mixers.
Fentimans describes a range of botanically brewed soft drinks and mixers, including tonic and fruit-led options.
Tesco Groceries lists both Schweppes Tonic Water and Schweppes Slimline Tonic Water.
Britvic announced classic and zero-sugar Indian Tonic Water in 330 ml grocery multipack cans in 2023.
Tesco Groceries lists own-label standard and low-calorie tonic waters alongside branded options.
These tonic waters are options for a sparkling drink alongside separately planned food, not replacements for a pre-workout snack. The selection includes light, standard and slimline formats; compare their exact labels and serving sizes.
No image available
A tonic to consider alongside a separate snack if you want a botanical sparkling drink. The Joybuy product listing states 15 kcal and 3.8 g sugars per 100 ml and identifies fructose and quinine; “light” does not mean sugar-free.
No image available
Choose the Mediterranean tonic variant if that is the flavour you want with separately planned food. The pack contains 8 × 150 ml cans; check its nutrition and ingredients against other tonics rather than assuming all light variants have the same figures.
No image available
This standard Indian tonic is a flavour-led option to have alongside, not instead of, a snack. Its 8 × 150 ml format makes the can size clear; compare the current nutrition label with a light tonic if sugar content matters to your choice.
No image available
This slimline tonic offers another labelled format to compare if you want tonic beside a separate snack. The pack contains 12 × 150 ml cans; read the exact nutrition and ingredients declaration before deciding whether it meets your preferences.
Do not assume that it can: a mixer is an optional drink, while food needs depend on the timing and activity. University College London Hospitals NHS Foundation Trust describes carbohydrate and protein in snacks eaten 60–90 minutes before exercise, with different considerations closer to activity and for people managing glucose.
Choose by flavour and the exact label, not by the word “light” alone. Fever-Tree states that its Refreshingly Light Premium Indian Tonic Water has 50% fewer calories than its standard Premium Indian Tonic Water, but the Joybuy listing for the light product still states 3.8 g sugars per 100 ml. Compare the portion you intend to drink, and plan food separately.
Choose water as the basis of your hydration plan. The NHS recommends it for replacing fluid lost through physical activity, while GOV.UK’s heat-illness guidance advises adequate safe-water intake before, during and after exercise in heat.
No. GOV.UK’s heat-illness guidance advises avoiding alcohol before exercise. If you choose a mixer beforehand, serve it without alcohol.
Read the exact pack’s ingredients, nutrition declaration and allergen information, then check its serving size against the per-100 ml figures. This matters when comparing light with standard drinks or checking for ingredients such as quinine; one product’s label does not describe every variant in a brand’s range.