I have an 07 G and it's running low on brake fluid. I plan on buying it on autozone but don't know what to look for.

You can use either dot3 or dot4 fluid.

If you have an 07 and the brake fluid is low, I sure hope it's only your pads that are worn out. IF you are really low and your brake pads are okay, you got more serious problems. As in a brake line leak somewhere.