Here are the basic and key items of FFVII in alphbetical order and, basically, where you can find them.
BATTLE ITEMS
Antarctic Wind- Casts Ice 2 on all enemies. Morph: Jumping; Win: Gold Saucer chocobo race
Basilisk Claw- Give one enemy the petrify condition. Steal: Basilisk
Bird Wing- Does roughly 1000 points of wind-typed damage to all enemies. Drop: Zuu, Tornadu; Steal: Zuu, Tornadu; Morph: Zuu
Bolt Plume- Casts Bolt 2 on all enemies. Drop: Needle Kiss, Thunderbird; Steal: Thunderbird
Cauldron- Casts Bad Breath (enemy skill) on one enemy. Drop: Dragon Zombie; Steal: Dragon Zombie; Win: Gold Saucer submarine game
Dazers- Gives one enemy the paralyze condition. Drop: Bound Fat, Evilap; Steal: Battery Cap; Morph: Bound Fat; Win: Gold Saucer submarine game
Deadly Waste- Casts Bio on all enemies. Drop: Smog Fact, Brainpod, Jejujemi, Slalom; Steal: Zenene; Morph: Brainpod
Dragon Fang- Casts Bolt 3 on all enemies (more powerful than Swift Bolt) Boss: Twinhead; Win: Gold Saucer submarine game
Dragon Scales- Does roughly 4000 points of water-type damage to all enemies. Drop: Adamantaimai; Steal: Sea Worm; Morph: Sea Worm
Dream Powder- Casts Sleepel on all enemies. Morph: Crown Lance, Criseiras
Earth Drum- Casts Quake 2 on all enemies. Drop: Flower Prong, Screamer; Steal: Christopher
Earth Hammer- Casts Quake 3 on all enemies. Drop: Gigas
Fire Fang- Casts Fire 2 on all enemies. Drop: Dragon; Morph: Land Worm
Fire Veil- Casts Fire 3 on all enemies. Buy: Wutai; Drop: Fourlander; Morph: Desert Sahagin
Ghost Hand- Steals roughly 30 MP from a single target. Drop: Ghost; Steal: Ghost; Morph: Stershize Step, Gi Spector
Graviball- Casts Demi 1 on one target. Drop: Deenglow; Steal: Shadow Makers
Grenade- Does roughly 150 points of type-less damage to a single target. Buy: Midgar Sector 5, Condor Fort, Junon (pre-meteor); Drop: Special Combatant, etc.; Steal: MP, etc.
Hourglass- Casts Stop on all enemies. Drop: Jejujemi; Morph: Insect Kimaira
Ice Crystal- Casts Ice 3 on all enemies. Drop: Garuda, Snow; Morph: Bandasnatch
Impaler- Casts Frog on one enemy. Buy: Gongaga; Drop: Grim Guard, Gremlin; Steal: Touch Me, Poison Frog
8 Inch Cannon- Does roughly 3000 points of type-less damage to one target. Drop: Chrome Well, Gross Panzer; Steal: Marine
Ink- Give one enemy the Darkness condition. Steal: Evilap; Win: Gold Saucer submarine game
Kiss of Death-Casts Death on all enemies. Drop: Death Dealer
Leco Weed- Casts Confu on all enemies. Drop: Hammer Smashers, Sword Dance, etc.
Molbor's Tentacle- Casts Bio 2 on all enemies. Drop: Stershize Step, Molbor; Steal: Molbor
Molotov- Casts Fire on one enemy. Buy: Gongaga, Costa Del Sol (pre meteor); Drop: Guard System, Hard Attacker
Mute Mask- Casts Silence on all enemies. Steal: Crazy Saw; Morph: Eligor, Funny Face
Right Arm- Does roughly 1500 points of type-less damage to all enemies. Drop: Grenade; Steal: Bomb, Grenade; Morph: Grenade
Shrapnel- Does roughly 400 points of type-less damage to all enemies. Drop: Bomb; Morph: Bomb
Shrivel- Casts Mini on one enemy. Buy: Gongaga; Drop: Grim Guard, Gremlin; Steal: Grim Guard
S-Mine- Does roughly 1500 points of type-less damage to one target. Buy: Condor Fort, Costa Del Sol (both post meteor); Drop: Marine, Gun Carrier
Spider Web- Casts Slow on all enemies. Drop: Grashtrike; Steal: Grashtrike, Insect Kimaira; Morph: Grashtrike
Stardust- Casts Comet 2 on all enemies. Drop: Serpant, Behemoth
Swift Bolt- Casts Bolt 3 on all enemies. Buy: Wutai; Find: Wutai; Morph: Bizarre Bug
T/S Bomb- Casts Demi 2 on one enemy. Drop: Flap Beat; Steal: Flap Beat; Morph: Flap Beat; Win: Gold Saucer submarine game
Vampire Fang- Steal roughly 200 HP from a single target. Drop: Black Bat, Evilhead; Morph: Black Bat
War Gong- Casts Berserk on all allies. Drop: Grand Horn; Steal: Behemoth
LIMIT BREAK MANUALS
All Creation- Yuffie's level four limit break. Boss: Godo (in Wutai)
