Potassium, Sodium
From Amazon
HIGH5 ZERO Electrolyte Tablets | Hydration Tablets Enhanced with Vitamin C | 0 Calories & Sugar Free | Boost Hydration, Performance & Wellness | Triple Pack, 60 Tablets (20x, Pack of 3)
Laxzo
High5 ZERO Triple Pack
Halfords
High5 Zero Triple Pack, 3 X20 Tablets