A long screwdriver and a rag will do just dandy. Put a rag in the #1 cylinder spark plug hole and rotate the engine by hand until it forcefully blows it out. This will be your compression stroke. Once that is established, stick a long screwdriver into the hole until it contacts the top of the piston. Now, just turn the engine over until you feel the screwdriver reach the top of the stroke. There's your #1 TDC.
Not as completely accurate as the piston stop method, but it'll get you with a degree of where you're supposed to be.
I've actually made a piston stop in the past out of an old spark plug. You can just break out the porcelain and the centre of the pug and thread a nut and bolt in, in it's place.