Boy Scouts of America (BSA)
The Boy Scouts are a very good way of learning to survival in my opinion due to the fact that they teach you many things about Survival. Such as tying knots that may help you, How to purify water, First Aid, etc. It may be a little expensive at first but it's a good way to start team building and learning. And best of all Boy Scouts encourages Physical Activity. Both are things you will need to survive with on ZDay

The United States Army
The Army is a great place to learn more advanced survival techniques and Physically Achieve more. Pretty much like Boy Scouts only the next step. There is however the chance you may die not even fighting the Zombies. Being a soldier also creates respect on ZDay, More chance of a group listening to a soldier than a TV Salesman.