You can even get eyedroppers marked with 100ml. I would recommend the glass ones, though. It's a great way to do it: Add 100ml of your liquid chlorine to 10 liters of tap water (five 2-liter soda bottles) and the dilution rate will be in parts/per/million. Use your FAS-DPD chlorine test kit to measure the chlorine level and that's how strong your liquid chlorine is.