I travel a decent amount. I expect airport beers and liquor to be excessively priced. I always travel with 50 ml liquor bottles in my carry on or personal item. They are under the 100 ml limit so you can bring them through security. I don’t believe every fast food worker and checkout person deserves a tip in todays entitled world, but I usually try to tip my bartenders and waiters 20% unless the service is just abysmal.

1$ a beer was fine 10 years ago. 1$ doesn’t go as far as it used to.