A couple of ground rules here, I don't like the idea of bottles in a parking lot. Drunks break bottles, glass in a parking lot can cause a flat tire or worse. With a good number of children going to baseball games, it's not a great idea to make them walk all over broken glass in the parking lot just to get into the stadium. So canned beer it must be. Also, the beer of choice has to work for the hot summer months and the cold April and September games. Lastly, the beer has got to be good, easy to store and transport and offer minimal trash. In my eyes, there's nothing worse than walking out of a baseball game to walk to your car and seeing beer cans laying all over the ground.
So after you put on your powder blue Royals shirt, or, as is the case an awful lot, your Derek Jeter or Albert Pujols (or if you're a real special kind of Cardinals jerk, Jack Clark or Tommy Herr retro jersey), get yourself to a liquor store and pick up a 4 pack of Oasis and enjoy your tailgate at the K.