Use a 3mL or 5mL syringe with a 20-22 gauge needle for reconstitution to accurately measure larger volumes of bacteriostatic water. For drawing doses, switch to an insulin syringe (0.3mL, 0.5mL, or 1mL) with a 28-31 gauge needle for precise small-volume measurements.
CDC injection safety guidelines recommend appropriate syringe selection for different pharmaceutical tasks.