One half lemon to a glass, or 2 or 3 to a quart of water. Other fruits "according to taste." Experiment here, using the juice and pulp of any fruit, combining those that are very acid with those that lack acidity, - lemon and raspberry, for example. One third to 1/2 cup sugar to a quart. The proportion cannot be stated with exactness, for fruit varies in acidity, and the final result must always be tested by the taste.