While bottled lemon juice is convenient, freshly squeezed juice provides a more pronounced taste. Factors like ripeness and size affect the amount of juice a lemon yields.
It may seem aggressive — and not a task for the kids — but repeatedly stabbing the lemon with a paring knife can help extract every last drop of juice.
Instead of draining only from the cut side, the lemon juice can escape from all the little holes you made in the skin, giving you the most lemon juice possible.