How do I apologize to my friend’s parents for being a bad house guest?

Anonymous
So basically long story short, a couple months ago in college I was invited to a good friend’s for pre-drinks and wasn’t watching how much I was drinking, accidentally got the most drunk I’ve ever been in my life and threw up on their couch... They still live at home with their parents so really I threw up on their parent’s couch! The parents were home at the time so I was mortified. I apologised and offered to pay to fix/clean everything while both drunk and sober but my friend said it was fine, that the couch covers washed perfectly and not to worry.

Fast forward to the summer, I’m going up to visit my college friends at the end of the month and this friend has said I could stay in their spare room to save me paying for a place. I haven’t been to the house or spoken to the parents since the incident. I am still insanely embarrassed and appalled by what happened and I don’t know how to approach a proper apology. I’m so anxious about even seeing the parents again. I’m definitely going to get flowers or something for them letting me stay over but is that enough? I don’t know what I should do...
How do I apologize to my friend’s parents for being a bad house guest?
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