As you may know drinks are free in Las Vegas as long as you're dropping money into a machine or playing at one of the table games. You can, however, score free drinks if you're watching someone else play or if you're just standing around in the Casino.
The trick is to tip well. It sounds simple but if you're sitting at the 25 cent slots tip the waitress $2 dollars, she will be back by the time your next drink needs to be ordered. Try tipping the waitress $5 right off the bat just so that she understands you're not cheap.
This goes a long way. After the initial tip, $1 is all that's needed. If you're winning, drop a few more dollars in. If you're playing at a one of the tables the chances are good you will see more waitresses come by but just to be sure pop in a good tip and you will easily have your fill of adult beverages.
UPDATE: Free drinks will be slowly fazed out in the future. Well, without being an alarmist we should preface that by saying that as the direction of amenities in Las Vegas resorts change so is the policy with regards to comps. Parking is no longer free at most resorts and as of late the cost of parking in Las Vegas is actually on the rise.
Naturally, free drinks will be next. Currently, some casino bars employ a system that gauges how much the customer is gambling in an effort to offer free drinks to those that are actually putting money into the slot machine or video poker machine. A light visible to the bartender lets them know if the player is getting a free cocktail.
Free drinks at the table games still exist and it's possible that that policy will be a little harder to change. Imagine stopping play just to allow someone to pay for a cocktail. While that may eventually happen it has not begun just yet.
The best advice when sitting at a bar with video poker machines is to ask if your drinks are free when you are playing. Remember, the bartender is not getting rich making drinks for you so you need to tip. They will take care of you if you are taking care of them.
Of all the things that change in Las Vegas drinks are still cheap if you gamble. Hit the nightclubs and you'll be amazed just how much they can charge you for alcohol. If you are looking for a few more ways to save money here are some tips on saving money on food in Las Vegas.