It's really nice to have a drink after doing manual labor. It helps relax the body after a long day of work. It also feels like you earned it. My brother doesn't have a drink in a day, unless he 'earned it'.
'Earned' is a self-defined term, and can only be applied to and by yourself. You must be hones. Did you earn it? If so, it's ok.
The thing I like about that is you don't get caught up in too bad of a cycle, because you must do to be rewarded. And that's what these experiments are about.