Okay everyone this is the FINISHED guide as the other one was confusing and very hard to edit with no copypaste in mobile browsing.
Credit goes to KarateChampChad, Myalana, D-Nitrate, Soulycon, oOHinataOo, Sam_Reynolds, StardustChampion, Tina101, ck2875, Joanna_Dark_, Katsuune, Hopper_34, xMINDBlIlURx, TonyDamiani, GoddessBunny42, LunarEmerald, Paystation_3 & EVERYONE else (hard to remember all of you ^_^) who helped find and list these combinations.
Creepy Cocktails List
•REWARDS
-Halloween Mug (Hand Item Male & Female) for entering the Adventure District *REWARD
-Halloween Mug (ornament) for entering the Adventure District. *REWARD
-Ectoplasm/ Gunpowder/ Pumpkin = Cat Claws (Male & Female Hand Items) *REWARD
-Gunpowder/ Hemlock/ Ectoplasm = Vampire Claws (Male & Female Hand Items) *REWARD
-Gunpowder/ Wolfsbane/ Pumpkin= Vampire Teeth *REWARD
-Gunpowder/ Hemlock/ Pumpkin = Devil Claws (Male & Female Hand Items) *REWARD
-Any combination using the 'skull' ingredient gives you a 'Sugar Skull' (Male & Female in 'Acessories')*REWARD
-Wolfsbane/ Hemlock / Gunpowder = Werewolf Tail (Male & Female Hand Item)*REWARD
-Gunpowder/ Ectoplasm/ Wolfsbane = Devil Horns (Male & Female Accessories Item)*REWARD
-Mix any combination with "Wing Of Bat" (last ingredient, found by playing Devil Dance) = Bat Swarm (Male & Female Hand Item)*REWARD
-"Tiki Seat" for mixing 5 different curses & mixing devil, cat & vampire nails*REWARD
-Mix all other ingredients (curses and reward mixtures) for "Tiki Head Statue" (ornament item, larger than the stool) [method of unlock not 100% verified yet]*REWARD
•CURSES (Temporary effects for Halloween Adventure District, NOT rewards)
-Ectoplasm/ Gunpowder/ Eye Of Newt = Swamp Gas (curse, not a permanent reward)
-Ectoplasm/ Pumpkin/ Eye Of Newt = Bat Swarm (curse, not a permanent reward)
-Pumpkin/ Eye Of Newt/ Gunpowder = Hot Head 1 (curse, not a permanent reward)
-Ectoplasm/ Hemlock/ Wolfsbane = Hot Head 2 (curse, not a permanent reward)
-Ectoplasm/ Eye Of Newt/ Hemlock = Spirit Curse [green colored] 1 (curse, not a permanent reward)
-Gunpowder/ Hemlock/ Eye Of Newt = Spirit Curse [green colored] 2 (curse, not a permanent reward)
-Gunpowder/ Eye Of Newt/ Wolfsbane - Spirit Curse 3 [orange colored] (curse, not a permanent reward)
-Pumpkin/ Eye Of Newt/ Hemlock = Fly Swarm (curse, not a permanent reward)
-Eye Of Newt/ Wolfsbane/ Pumpkin = All Seeing Eye 1 (curse, not a permanent reward)
-Eye Of Newt/ Ectoplasm/ Wolfsbane = All Seeing Eye 2 (curse, not a permanent reward)
-Eye Of Newt/ Hemlock / Wolfsbane = Pumpkin King (curse, not permanent reward)
-Hemlock/ Wolfsbane/ Pumpkin = Haunted Head (curse, not permanent reward)
•INGREDIENTS (**Times will effect when certain ones will appear**)
Gunpowder – Found in Adventure District
Eye Of Newt – Found in Adventure District
Hemlock – Found in Adventure District **
Wolfsbane – Found in Adventure District **
Ectoplasm – Play Lightning Limbo
Skull – Play Lightning Limbo
Pumpkin – Play Devil Dance
Bat Wing – Play Devil Dance