How can I make a homemade squirrel baffle out of a coffee can or milk jug or something else?

Use the large size tin. Use a clean one as well. Punch a hole near the lip of the can and second on at the bottom of the can along the same radius in order to balance the tin when you hang it in a tree or wherever else you choose. Get a clothes hanger,one made of wire if that isstill possible these days, or a length of other heavy wire. Attach this wire to the tin and give it to the squirrel.