Re: breaking someone else's gear, feel like a heel
We still haven't rectified the alcohol abuse, and I fear it's too late.
Proper decorum suggests that you should have lapped up the spilt beer or at least squeezed the beer out of the rag and into a cup! At the very least, you could have encouraged his puppy to do the clean-up, rather than have the beer go to waste.
You haven't mentioned the beer brand/style - some canned light beers should be mopped up with a rag. So maybe there was no foul.