The ABC store is the way to go for everything. I love that we had one close to our hotel, very convenient. This is your one stop shop for everything you might need in Vegas.
+ Food, snack, water, alcohol
+ Las Vegas souvenirs!!
+ Toiletries
They have so many different souvenirs and Hello Kitty themed items. I really liked that they have 1 liter water for $0.99!! Don't forget to drink plenty of water when you're in the dessert.