Get more juice: select a lemon with a thin skin. Before juicing, put the whole lemon in the microwave for about 15 seconds, and you might even double the amount of juice you get. If you don’t have a microwave, submerging your lemon in hot water for 15 minutes before squeezing will yield much more juice.
Storing: Never waste that extra lemon juice. Store it in your ice cube trays and freeze.