I had fun with this!
- when I try to make watermelon nectar, I'm told I don't have any "grape". When I click on the pineapple icon without having any pineapple, it still makes it, but uses watermelon instead.
- If I have the supplies for one of the drinks the customer wants, but not the other, why am I not able to make the one drink for them and offer a refund on the other for partial credit?