Convenient ready to drink solutions have the advantage that there is no error in mixing. 1 Litre and 250 mL bottle can last up to 1 month after opening in the refrigerator. Hydralyte Ready to use Electrolyte solution is suitable for the entire family, including babies, pregnant and breastfeeding mothers. TIP: When administering Hydralyte Ready to use Electrolyte solution to babies and infants, pour Hydralyte directly into a sterilised baby bottle or sippy cup. Alternatively, use a small dosage syringe to administer the solution directly into the mouth.