I don't know how to post link so............
To make 50ml of bac water: Get an empty 50ml sterile vial. Get a "larger" syringe - I use a 20 ml. Buy some "distilled" water and BA. Use a 3ml syringe and draw up 1.5cc of BA, then sterile filter it into the 50ml vial. Run 48.5cc of distilled water through the SAME filter into the vial. Result - 50ml of sterile baceriostatic water with 3% BA. You may need to shake it up before using/drawing from the vial.
Sterile syringes a board sponsor should sell the filters needed, and i believe you can pick up sterile vials from any speacialty pharmacy.