Hey MSYtristar! I did AUS
on the ERJ-145 last year (January). The departure was scheduled for around 2 or 3 p.m. (but had a one hour or so delay). I believe we were fed a ham and cheese croissant sandwich, a bag of peanuts or chips (not exactly sure), and maybe a cookie (¿?). As for drinks, we were offered soft drinks, coffee and beer. I am not entirely sure there was a larger selection of alcoholic drinks (which is the norm on mainline and on the E-190 jets).
I think it is very cool that you will be supporting the AM
Would you be interested in me treating you and your buddy to a drink while you are in MEX
Next flights: MEX-LAX AM 738, LAX-PVG DL 77L, SHA-PEK CA 789, PEK-PVG CA A332, PVG-ORD MU 77W, ORD-MEX AM 738