Here’s a “Dollar Stretcher” tip for making lemonade that appeared in a hundred-year-old magazine:
If you add a teaspoonful of cream of tartar for each lemon, you can make double the amount of lemonade for the number of lemons you use. Another way to make your lemonade cheaper is to put the lemon rinds through the food chopper, pour ice water over them and drain. By doing this fewer lemons are needed.
Ladies Home Journal (January, 1918)