I have found that one drop of liquid equals .01 cc. Just fill a syringe with water to a mark on the syringe and drop out 10 drops and you will have you measurement.
As Sarah says there is a front loading period of two weeks where you give your bird .5cc once a day, then drop back down to the 10 drops per day. Yes you can mix it in with the formula - if he takes the whole thing.
DMG is very non-toxic so don't worry about overdosing - but don't be sloppy about the dose either.