We did this as well. My friend and I did drinking around the world. I don't remember the cost because we both took turns buying. We bought 2 beers (we only drank beer) on the first stop. On the 2nd stop we only bought 1 drink and poured it into one of our cups. We did this until the end of the night. I do think we bought 2 drinks when we knew we were going to like the beer we were getting. I was fine at the end of the night. My friend was another story.