For a substitute for ferric chloride, you can use a mixture of Hydrogen Peroxide and Muriatic Acid. Get the Peroxide at a dollar store, and the Acid at a hardware or pool cleaning store.
A 1 to 1 ratio is average. Many people use 2 cups Peroxide to 1 cup Muriatic Acid, but if you are only doing a 2" x 2" board, you can use shot glasses instead of cups
This is no joke, you can not put a lid on this stuff or it will blow the container to pieces from the pressure building up.
Do a search for Hydrogen Peroxide and Muriatic Acid PCB Etching and read the cautions and warnings.
You also want to do this in a well ventilated garage or outside because much fumage is produced.
Do not dump it in your moms sink, it eats metal remember?
If you do not have goggles and gloves, just erase this and act as if you have never seen it.
You will blind yourself and get acid burns on your flesh if you do not be safe.
Sunglasses and/or prescription glasses are in NO WAY a substitute for goggles. NOT EVEN CLOSE.
Standard dish pan gloves are fine.
Be smart, follow safety instructions, and this is a very good quick etchant.
Make what you need, as storing it can cause explosions, and that is not good.