BOG lunch Preorder

[Life is good]

So if you want to do the switch a drink for a soup and have free water do you preorder the soup and entree and dessert? Can the computer figure out what you are doing and not charge for the soup? How do you get a water cup? TIA

 

[Life is good]

Forgot to mention we are on the dining plan so this would be doing the switch a drink/dessert for a side.