High5 Zero Electrolyte Tablets for Hydration, Orange & Cherry, 160 Tablets (£17.25 max S&S, £15.22 if Prime Student)

If you want popular branded hydration tablets then you can do a lot worse than this.
£20.30 for a one off purchase
£18.27 or £17.25 on Subscribe & Save depending on which tier you qualify for
If you are a Prime Student member then you get an extra 10% discount which means that you if also qualify for max S&S the price is just £15.22 or £1.90 per tube.
These prices only apply to Orange & Cherry although Tropical is not much more.
Replenish Electrolytes – ZERO electrolytes tablets ensure superior hydration and fluid balance over water alone: Easily stay hydrated throughout the day, even during intense workouts or hot weather
Scientific Formulation: ZERO sugar free electrolytes are rigorously developed for efficacy and convenience. 0 calorie electrolyte supplement with a variety of great tasting natural flavourings
Optimised Performance – Power through training and races with reduced fatigue and enhanced endurance: Support recovery with precise levels of sodium potassium magnesium electrolytes
Immune Support & Wellness – Rehydration tablets with electrolytes support your immune system and fight oxidative stress: Travelling essentials, electrolytes for fasting, keto electrolyes
Use Anywhere – Just drop a tablet into water for a refreshing electrolyte drink, ideal as backpacking essentials and long haul flight essentials: Stay energised on-the-go
Per 4g hydration tablet: Magnesium 56mg 15% RI, Potassium 70mg 3.5% RI, Calcium 9mg 1.1% RI, Vitamin C 28mg 35% RI Sodium 250mg, Green Tea 1mg