I know a bunch of bar drinks from playing SS13 a long time ago that are very very powerful and useful for many situations.

Before I talk about any of the drinks, I would first like to talk about your tools. The first of which are your shotgun, bandolier, armor vest that you spawn wearing, and your beer goggles. Cherish them. Load the shotgun and your bandolier with buckshot. Make love to it Don't saw it off with a circular saw to make it smaller unless you're switching armors so you can put it in your bag, and make sure to unload it first or you'll shoot yourself in the face. You spawn with two armor vests so if you want to keep yours, you can give out the second one if you so wish, maybe organize a contest or something or ask an assistant to retrieve an item for you in exchange for it. Your beer goggles are extremely useful because not only do they function exactly like sunglasses, but they allow you to see what chems are in any beaker in the game. Normally, if you examine a container, you will see how many units are in the container, but not what these chems are. The beer goggles allow you to see what these chems are. The second of your great tools is your box, the box that everyone spawns with. The thing that makes this particularly useful is that it can be combined with your third tool, bottles. Bottles are legitimately one of the most overpowered items in the whole game because if you switch to harm intent and hit someone in the head with them, it deals 15 damage, stuns them for 2-3 seconds, and covers them in whatever was inside the bottle, (including chemicals you can make if you empty it out, though I will go over those later) though does not stun if they're wearing head armor. You can smash a bottle over someone's head and floor them, then just keep pulling out bottles and smashing them over the head with them until they die, then going back to your booze-o-mat to get more bottles. Due to these bottles spraying the victim with whatever was contained inside them, this means that the rather flammable alcohol they are likely covered in can also be lit on fire, so you can whip out your zippo that you spawn with and light them up before continuing to atomize them with bottles. Something else you can do with these bottles is create molotovs out of them. Molotovs are best made with vodka bottles by tablecrafting a damp rag (one spawns at your bar, and they can be found both in maint and created in botany) and a bottle, and once lit and thrown, will create one tile of fire that will do a LOT of damage. Something I liked to do was bottle smash people and then throw a molotov when they were floored. Back to your second tool, boxes. The reason why your box is your second most important tool is because they can hold SEVEN bottles that you can use to smash people into oblivion, or even seven molotovs. Bartenders on /tg/ spawn with two boxes, one with the internals that everyone has, and the other full of beanbags that do a lot of stamina damage, allowing you to have a lot of flexibility in regards to storage. You can transfer the beanbags to your bandolier by click dragging the box onto your bandolier. Additionally, once smashing a bottle, it creates a broken bottle that does 9 brute and on some /tg/ forks causes bleeding, so you can also stash that in there as a useful melee weapon

One of them is Neurotoxin which is rather widely known. This is made by having half morphine and half pan-galactic gargle blaster. What this does is instantly stun and I believe mute the person it is injected to. The damp rag that spawns on your bar works for this purpose if you set it to harm intent, causing you to smother someone with it and injecting up to 5u of any chem instantly, including neurotoxin if you soak it. Also works if you empty a bottle and fill it with Neurotoxin. If you smash a full bottle over someone's head filled with this it will put them down for many minutes. You can empty an alcohol bottle by pouring it into an empty glass then dumping the contents of the glass onto the floor by clicking on the floor when on harm intent.

Another one is Hearty Punch. This requires 5 units of Brave Bull, 5 parts Syndicate Bomb, and 5 parts absinthe. After the ingredients are in a beaker, heat it with a welder or lighter, this activates the mixture and creates 5u of Hearty Punch. What this chem does is that if you go into critical condition, causes 6 of all forms of healing to heal you every second. Due to it being a bar drink, it also intoxicates you, though this is far worth being drunk as unless someone is stabbing you to death with an esword you will survive almost anything hitting you and get right back up, and even survive very powerful weapons if wearing armor. People might think you're a ling if you get up out of crit like this, so make sure to have a chat message ready. Likely a different story now that dismemberment is a thing, as they will just cut off all your limbs while you're down. Though for the aspiring traitor this could serve a good purpose, keeping your victims alive and ready for you to chop off all their limbs and rip out their tongue, creating a screaming worm-man who can only suffer. Also of note is that this is the most difficult drink to make, and also takes longer to make than any other drink I know.

The next one is Changeling Sting. For one full glass, mix 20 lemon-lime and 10 Screwdriver Cocktail, as this drink seems to generate matter and produce more chems than you put in it. What this does is it restores the chemicals of changelings at a VERY fast rate. Almost nobody actually knows about this so if you're ever a ling and are seen chugging down changeling sting nobody will care and it will give you huge benefit. Useful if you intend on spamming spiders, especially as a bartender due to your secluded back room and easy access to vents for your new spiders. Make sure to cut the camera in your backroom first though before you do this or you'll get fucked by the AI.

The last one, and the one I found the most useful, was Doctor's Delight. One full glass is made with 10 lime juice, 10 tomato juice, 10 orange juice, 10 milk cream, and 10 cryoxadone (there's free beakers in medbay roundstart), producing 50 units of Doctor's Delight. What this does is heal you every second for 0.5 of all forms of damage, and though it drains your hunger at a modest rate, you can just pour some water in a cup ramen and get all the hunger back near-instantly. For doctors, however, this drink has no hunger drain at all, meaning that if you're ever a Medical Doctor (but not the CMO) you can make some of this for easy healing on the go. Due to it's full-body healing properties, this is a very useful chem for spacewalking if you find yourself without a suit, though it doesn't heal fast enough to keep you out there forever.

Cuba Libre is created with 30u of rum, and 15u of Space Cola. This heals revolutionary antags for a good amount, so if shit's going Viva put some of these drinks out and tell people about what they do, you'll be a good help. For revolutionaries in particular this is like Doctor's Delight but easier to make and has no downsides outside of getting people drunk. If you find yourself a revolutionary, make this instead of Doctor's Delight.

Added bolding for tl;dr if people just want pure information. I'll be adding more useful and obscure drinks to this as time goes on.

Edit: Some other special properties of your drinks is that lime juice has a 10% chance to heal 1 toxin damage every tick. Milk cream has a 10% chance to heal 1 brute damage per tick. Milk heals skeletons a giant amount if they can get their hands on it. Tomato Juice has a 10% chance to heal 1 burn damage per tick, and Orange Juice has a 10% chance to heal 1 oxygen damage per tick (basically useless). These heals are useful for extremely minor damage, though you may have to drink a lot to get healed all the way for even singular digits of damage.

Additionally, the coffee you can vend out of your dispensers and any coffee machine on the stations heats people up no matter how cold they are (useful against cryostings that changelings use), and wakes people up if they're asleep, which is very useful if someone is put to sleep with morphine as this negates it entirely. Including yourself. If you're ever shot with a syringe of morphine you can drink a cup of coffee (watch out for burning yourself) and it won't ever put you to sleep, allowing you to ignore it entirely. On the other side of the coin, many of the sodas you can vend from your soda dispenser cool people down if they're too hot. If a plasma fire is out and about you can be of great help if a room is just too hot to handle.