I'm wondering how I can, if there is work around, what others have done, etc-on upcharging items.

Example-we are a coffee shop and bakery and cafe-our lunch menu has a meal or only option for each of our menu items. So you can get a grilled chicken panini as a meal or as a single sandwich. A meal for us means the sandwich comes with a side and a medium fountain drink/tea. Our customers regularly like to instead of a medium drink, want to make it a large, or extra large, or instead of a fountain drink a cherry limeade, iced latte etc.

So when our customers order online a lot of times they just add a note that they want their drink to be an extra large cherry limeade. And then when they come to pick up their order and speed out the door we have to stop them and say sorry your drink request is not covered under the meal, so you will have to pay for it separately and it's a whole thing. And sometimes in rushes baristas won't even stop and ask they just give them the more expensive drink for no charge.

Is there a way without making a modifier set for every single kind of drink we have, for there to be some sort of upcharge or way for them to add on a more expensive drink? What do other places do? Thank you!