Warforged don't need to eat or drink, but can if they want to.  They don't have digestive or excretory systems, so where does the food go?   Do they have a storage compartment inside them that periodically needs to be emptied?  Or is it more of having a bag of devouring that's always open?

I always assume that they have a tank of acidic fluids in their body. When they consume organic matter, it goes there and is broken down by the acid and the nutrients are distributed throughout the warforged's body and used as fuel (though this is not the only way of gaining power).

Who says they don't have digestive or excretory systems?

Saying they can eat if they want to, and not mentioning the capacity limits of wherever the food goes when they swallow it, implies that whatever is eaten goes away as easily and equally unoteworthily as it does for all the other races in the game. That sounds like some kind of digestion, excretion, or both to me.

I always assume that they have a tank of acidic fluids in their body. When they consume organic matter, it goes there and is broken down by the acid and the nutrients are distributed throughout the warforged's body and used as fuel (though this is not the only way of gaining power).

Robocop

I recently played a warforged who had a 'nervous eating/drinking' habit. He'd try to seem normal to other races by doing things they think are normal. He's only one of a dozen warforged in the entire (homebrew) gameworld. 

Anyway, my DM asked me what I thought would happen to the materials he ingested and I suggested that they could be processed in such a way to help the various 'wood, stone, and metal' parts of the warforged. The warforged produced in our gameworld so far are built mainly from wood and stone, while their joints are forged from metal. 

-IT

As I role played mine, warforged don't need to eat, but do have a limited ability to eat, and a bit better ability to drink.

I conceive as the warforged "stomach" as kind of in internal compost bin. There's worms and bacteria and stuff in there to "digest" anything organic you put down there into rich, tasty soil, which the warforged can absorb through tiny roots in its "intestines".

Stuff takes quite a long time to digest in there, though. You can't eat often, and your breath might smell like what you ate last week, but a little more pungent. Eat too much strawberry jam and you might attract ants.

As far as drinking, it's not too much of a problem. The liquids absorb into the soil in your gut, although they slowly seep out like water through a potted plant. In drinking contests, you have advantage, since alcohol is technically speaking a poison.

A precedent for warforged having acid in a "stomach" is carnivorous plants like Venus fly traps and pitcher plants. They digest the prey they catch slowly with weak acid.

But practically, this does have some limitations as compared to most races. Since you digest slowly, I don't think you can sustainably consume as much food as typical humanoids. You could eat three meals a day for one day, and then you'd have to fast. Not really a problem, unless you were trying to hide your nature from someone keeping an eye on you 24 hours a day.

If you just want to partake of some ale at the tavern or a Heroes' Feast, go right ahead.

If a warforged doesn't need to eat or drink, i don't think it has morphology for it. There could be a collector that need to be emptied 

Warforged can keep miniaturized goats in their guts.  That way they can eat everything while keeping the world's miniaturized goat population from going extinct.  Win-win.

The Warforged the OP was asking about could have just let time go by and the contents would have naturally decayed over the years. 

If I were playing a warforged, I just wouldn't want to eat or drink. My brain would be driven to answer this question. That brings up another question: When warforged eat beans, do they fart?

There's a bajillion different models of warforged. All are partially biological, and all take in energy in some way. Some may simply eat. Others may have methods depending on their creation. If the organic parts of the warforged were taken from plants, they may sprout roots, and grow leaves and flowers, as they suck sustenance from the soil, sun and air. A warforged with insectile DNA (so to speak) might vomit up a glop of acid on it's food, and slopper it down once it's nicely dissolved. 

I like to imagine more exotic types. Vampiric warforged that barely function in direct sunlight, but get limited healing if they can absorb the  blood of a living sentient (not a combat option, still like eating a meal - more specifically, injecting a syringe in the vein of a sentien with a beating heart). Kelp based oceanic warforged that feed simply by being immersed in salt water.

Warforged that aren't humanoid. 

Of course, these are all just the feverish ideas of a diseased mind =)

But do they FART? Can I make a Warforged rogue who's flaw is "I'm extremely gassy. My farts are loud and terrible, and often give me away"?

Quote from BorivikStormwind >>

But do they FART? 

 Again, it depends. Some exhale pure oxygen. Some burn of waste gasses like a breath weapon. But yes, some warforged fart - those based on bovine strands are famed for their flatulence.

Bet