This has always been a point of contention among the CHL community. I think it's safe to say that drinking while packing is not a good idea.  But its also not safe to not carry at all.... So, what does the law say?  The state of Texas is pretty clear.

   It is not illegal to carry a concealed handgun while drinking. It IS illegal to carry a concealed gun while INTOXICATED.

   This begs the question, what does the state of Texas consider "intoxicated"?

   It's defined specifically in PC 49.01
http://www.capitol.state.tx.us/statutes/docs/PE/content/htm/pe.010.00.000049.00.htm

(2) "Intoxicated" means: 
   (A) not having the normal use of mental or
physical faculties by reason of the introduction of alcohol, a
controlled substance, a drug, a dangerous drug, a combination of
two or more of those substances, or any other substance into the
body; or
   (B) having an alcohol concentration of 0.08 or
more.

    So what that means is that if you are, in the opinion of the LEO (Law Enforcement Officer), impaired or behaving in a way that makes him think you're impaired, then you're about to have a very bad year.

    People get really up in arms (no pun intended) over the fact that they'd "rather be judged by 12 than carried by 6".   But because this area is so subjective, I say let's think more simply about this...... can you have a beer with your steak and pack heat?  Yes, as long as you're not impaired after doing so.  This is, of course, going to vary with the person drinking that beer.  I'm a big dude and can handle a beer without being impaired. But 2 or more, and I'm gonna go put the pistola in my car safe.    If you have 2 drinks and start getting woosy, then you need to be more careful than the next guy or gal.