1 small lemon
1 1 quart mason jar
14 ounces cold water, divided, or to taste
1 1/2 tablespoons white sugar
5 ice cubes, or as needed
Roll lemon on a flat surface, cut in half, and squeeze juice and pulp into mason jar. Pour 12 ounces water into the jar.
Stir sugar and remaining 2 tablespoons water together in a small saucepan over medium heat until sugar dissolves. Pour sugar mixture and ice into mason jar and stir.