Most coffee-brewing systems have an optimum brewing capacity. It is almost always necessary to increase the ratio of coffee to water when brewing smaller amounts.

The basic recipe is 2 level tablespoons of coffee per 6 ounces of brewing water. 

The ratio may seem strong, but these measurements  develop the proper taste and a balanced brew. 

If overpowering to the individual taste, the brew can easily be diluted with hot water in the cup.