Sant'Anna BEST Sant'Anna Water » BEST BEST. Hydration Isotonic Drink. Sant’Anna BEST is a carbohydrate-electrolyte solution: it helps maintain endurance performance during prolonged physical exercise.It contains vitamin B6: it helps reduce tiredness and fatigue. Preservative-free Gluten-free Sugar-free with sweeteners Ready to drink Available in 3 flavors: Buy it on Amazon