The Mexican Red Cross -- Cruz Roja Mexicana -- has a nice updated webpage which you can go to to donate directly at: http://www.cruzrojamexicana.org.mx/pagnacional/index.jsp
If you want to donate medicines, please contact one of the following or information on how to do it. It is complicated. Neither of these groups has a current project in Veracruz, but they can tell you about shipping drugs across borders.
Partners in Health: http://www.pih.org/
Doctors without Borders: http://www.doctorswithoutborders.org
Money remains the most useful donation -- the easiest to send, receive and make use of from foreign countries. It isn't meant to be ungrateful; it is just that there are all kinds of hurdles involved in shipping and receiving meds and foods.
My recommendation is Cruz Roja, a money donation.