There are a grand total of 9 mixable drinks that can be made at the start of the game in the food court. There is a blender in Rojo Diablo Mexican Restaurant (located here
http://vignette4.wikia.nocookie.net/deadrising/images/7/74/R...)and you can find all the ingredients you need in the following places:
Wild West Grill House (
http://vignette1.wikia.nocookie.net/deadrising/images/c/cb/D...) - Vodka x 3, Beer x 2 and Bacon
Cucina Donnacci (
http://vignette3.wikia.nocookie.net/deadrising/images/1/15/D...) - Wine x 2
Lombardi's (
http://vignette2.wikia.nocookie.net/deadrising/images/b/bc/D...) - Jelly Beans
Hamburger Fiefdom (
http://vignette1.wikia.nocookie.net/deadrising/images/2/2f/H...) - Hamburger and Onion Rings
Rojo Diablo Mexican Restaurant (
http://vignette4.wikia.nocookie.net/deadrising/images/7/74/R...) - Taco x 2, Apple and Chili
Hungry Joe's Pizzeria (Could not find an image for it, but it is in the food court as well) - Large Soda x 2 and Pizza
Here are the combinations needed:
1.) Pain Killer - Vodka + Vodka
2.) Quick Step - Wine + Beer
3.) Randomizer - Wine + Vodka
4.) Spitfire - Bacon + Onion Rings
5.) Nectar - Jelly Beans + Beer
6.) Energizer - Taco + Hamburger
7.) Repulse - Chili + Large Soda
8.) Untouchable - Pizza + Large Soda
9.) Zombait - Apple + Taco
For those that do not care to read, here is a video from AchievementHunter:
Good luck and let me know if you need any help!