Do you think this is okay for a rummage sale?

This is probably a dumb question but my cousin thought of an idea to sell lemonade at the rummage sale my family is having and then I thought of the idea to give free lemonade for any $2 purchase I'm selling them in actual size cups not the tiny Dixie ones. Or should I just sell the lemonade for like .75-1.00?

If you want to make money,don't give the lemonade away for free. Charge 50 cents for a small cup and 1.00 for a large cup.