Half a CC if you don't have any type of syringe or cup is approximately 10 drops from a dropper in my experience. I go to the pet store for syringes they cost about 50 cents. The garden store sales them for about 6 bucks, given they are very large, but I like to have a few around and the little ones do me just fine, when I need to get into TSP then I get a little measuring cup for a $1 at the garden store that gives me I think about a dozen or more tea spoons in measurements.
Adieu