Met a girl a few weeks ago and after helping her out with something trivial I jokingly said she should buy me a drink. Her response was "hmm that could possibly be arranged"

So the date is tonight, a few weeks later (due to logistical stuff getting in the way), and we're casually just getting drinks at a sit down bar on a Monday night.

Should I bring up that she owes me a drink and ask her to buy me one or just drop it and buy her 1 drink, or just go complete dutch?