A.B.
I can't help you w/how to make it, but to the mommies below:
We've used garlic oil when our son showed signs of ear infections and he has never had a full-blown one. Garlic is a natural antibiotic as well as an antiviral, so it is very effective.
The research no longer supports antibiotics as the "go to" just because an infection is detected. Repeated use of antibiotics may alleviate symptoms, but does not do anything to protect from future infections, so kids actually become more susceptible to them. In addition, antibiotics can disrupt the natural balance of good bacteria in the body and gut, compromising the immune and digestive system and increasing the risk for yeast infections and sickness.
Most drs who are current w/the research often agree to a "wait and see" approach rather than running out for antibiotics. I commend you for going this route - Herbs for Kids also has a great garlic oil.
ETA: Ditto to Jackie! Our son has been in weekly chiro care since he was 3 weeks old and it has helped w/ many things - check it out!