On the southern end of "The Strip" and there are several mini-marts at the AM/PM gas stations. You can buy water & soda in various sizes, and snacks.
The AM/PM mini-marts I am talking about are on 1. Las Vegas Boulevard (the strip) at Reno St; 2. Las Vegas Boulevard between Tropicana and Reno streets.
The first thing I did was scout out for these mini-marts to stock up on water!
Another tip is that if you are gambling, the drinks are free! If in the casinos while you are using the slots or at the gaming tables you order from the casino waitstaff ladies walking around. It is customary to tip the staff who brings you the drinks. They work hard and are on their feet for very long shifts.


