"Mocha" mix

1 cup powdered milk
1/4 cup cocoa powder (unsweetened, as for baking)
1/3 cup sugar
3 tablespoons instant coffee

Mix ingredients. Place in a tupperware container.

To use:

Heat a cup of water (about 90 sec in the microwave). Mix in about 4 teaspoons of mix. Drink!

You may find you want more or less of some of the ingredients. That's up to you. I just made this up this afternoon, as I was having a mocha craving and there's no way I was going to buy a real one.
It satisfied the craving.