Adult fireflies aren't the only ones that glow. In some species, the larvae and even the eggs emit light. Firefly eggs have been observed to flash in response to stimulus such as gentle tapping or vibrations. This is an image of a firefly larvae just emerging from the egg.
http://www.firefly.org/facts-about-fireflies.html
Fireflies eat other fireflies. Fireflies are primarily carnivorous. Larvae usually eat snails and worms. Some species of fireflies feed on other fireflies—most notable is the genus photuris, which mimics female flashes of photinus, a closely related species, in order to attract and devour the males of that species.
http://www.firefly.org/facts-about-fireflies.html
Common household fruit flies of the species typically found in kitchens and around ripening fruits do not bite. These insects, sometimes called vinegar flies, are attracted to fruit because of the vinegar released as a byproduct during the natural fermentation process.
https://www.reference.com/pets-animals/house-flies-eat-a5ba8b052e8e8988
House flies eat things such as decaying matter and feces. They also feed on garbage, spoiled meat and rotting fruits.
https://www.reference.com/pets-animals/house-flies-eat-a5ba8b052e8e8988
The males who are looking for a mate that is the same species flies to the female looking for love in all the wrong places. The female then eats the male for all his trouble.   Animals that eat fireflies would be bats, mice, birds, fish, fox, toads, frogs, and even a cat. Cats are eating an insect because they enjoy the chase. It is a hunting instinct of a tame house cat indulging in play.
http://www.answers.com/Q/What_do_fireflies_eat_and_drink
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The female fireflies from genus Photuris are known to eat male fireflies from another species called Photinus. The female fireflies actually mimic the flash pattern of photinus species to attract the males and create a death trap for the male. Most children would love to catch fireflies to see them glow at night.
http://www.buzzle.com/articles/what-do-fireflies-eat.html
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https://www.quora.com/unanswered/What-do-fireflies-eat-How-long-can-they-live-without-food
What attracts house flies? Houseflies are attracted to decaying organic matter which they use both for food and as a place to lay eggs. They're also attracted to sugar and non-decaying food matter, but they're primarily interested in moist, rotting food and decomposing garbage.
https://www.reference.com/pets-animals/house-flies-eat-a5ba8b052e8e8988
What do Fireflies Eat. Fireflies, which are also called lightning bugs, are insects belonging to the Lampyridae family of the beetle order. This Buzzle write-up provides interesting facts about fireflies, including the reason why they glow and what do fireflies eat and drink. Watching fireflies glow in the dark night sky definitely excites children.
http://www.buzzle.com/articles/what-do-fireflies-eat.html
what do fireflies eat and drink
Firefiles eat snails and worms.