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A lemon cell battery is made with a lemon and two metallic electrodes of different metals such as a copper penny or a copper plating and a galvanized (zinc coated) nail. In practice, a single lemon cell is incapable of lighting a light bulb; one would need about 500 lemons but wired in parallel to light a standard flashlight bulb.
It's possible to make a battery using cat food! To do this, open the tin preferably without the cat being near otherwise it'll expect to be fed. Put a fork into the middle of the food so the fork stands up and doesn't touch the can. Now there is a voltage between the fork and the tin can. This is because the fork and the can are made of different metals and the cat food becomes an electrolyte and conducts electricity to some extent. The amount of electricity generated by a catfood battery is not great and won't light a bulb, but it is measurable and will drive "solar" motors.