chocolate sauce

My new penny pinching thing to do is homemade chocolate syrup instead of the store bought one for chocolate milk.
On the stove in a small pan, heat up a cup or 2 of water with 5 tablespoons of cocoa powder, 5 tablespoons of sugar and some vanilla extract. I head it all up.
In the mean time put a teaspoon of cornstarch in a cup with a little water, mix it up and add it to the syrup, it will thicken it up a little bit.
Using a funnel, put your new chocolate sauce in the same bottle, the kids might not even notice it's homemade syrup! and it saves you $$$