Once inside the zoo can we go to our car and get our lunch, without been charged again or should we bring it in with us when we first get there?

As long as you have a receipt for admission you will have in and out access

Absolutely, just make sure to let the ticket master know that you'll be right back into the zoo.

Your receipt allows all day access.

Re-entry is permitted with your receipt, but you can also bring outside food in to the park as long as its not in glass containers.

Yes you can!

You have in and out privileges with your ticket

It's recommended to bring it in with you coolers are allowed into the park