Imagine Ruru and Runa are in the same restaurant with their significant others or something, but the servers get their orders confused because their names are so similar
Ruru generally wouldn't mind! She'd still inform the wait staff because she'd at least like for the other person (Runa) to get the food they ordered! Ruru isn't picky and she doesn't have any specific diet or restrictions so she doesn't mind eating what she was handed!
Florance would think it's a little funny to see his wife who has hunted down bears for purpose of food and usually gets large bloody steaks to be handed something like vegetarian stuffed peppers!
Meanwhile Edsel would have to flag down wait staff to inform them of the mix up bc the smell from the big rare steak directly in front of Runa would make the mermaid too nauseous to even speak (Thanks Bebê <3).
After the steak his removed from in front of Runa, he'd apologize to the staff helping because he'd feel bad about having them do extra work even if it was a mix up on their part. While waiting for the food he did order, Edsel would gently reassure him that if he doesn't feel well they can leave and that he doesn't have to eat what's put in front of him.
Runa would confirm he's fine after a moment and that he'd still like to eat at the restaurant :>
After the mix up is resolved, everyone enjoys their dinners and Ruru gets to try vegetarian stuffed peppers for the first time! She certainly likes them and makes a note to try regular stuffed peppers! (And Florance goes ahead and saves recipes for stuffed peppers so he can make them for her!)