The absolute worst beer you can get anywhere is...

[SSatVT]

Let's see:

Natty Light
Keystone Light
Bud Light
Miller Light
Miller High Life (I am pretty sure this is what piss tastes like)

Ehh...I could go on and on and on and..you get the idea. Basically any light beer and I would have to add Guinness Extra Stout.

<whew..I feel better now>