This is actually a db topic, but if you go to skill_require_db you can modify what each item requires. If you notice for EDP it has 678 (poison bottle) and a 1 following it. That is the quanity required. You have one of two options. You can leave the 678 and put a 0 in the second space. This requires the player to have one in their inventory, but does not use it up. Second is you can replace both the 678 and 1 with 0 as I did in the second box. That means you don't need to have a poison bottle at all. I hope this helps.
Peopleperson49
Normal skills requiring items:
Enchant Deadly Poison:
378,0,0,60:70:80:90:100,0,0,0,99,0,0,none,0,678,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 //ASC_EDP#ƒGƒ“ƒ`ƒƒƒ“ƒgƒfƒbƒhƒŠ?ƒ|ƒCƒYƒ“#
Acid Demo:
490,0,0,30,0,0,0,99,0,0,none,0,7135,1,7136,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 //CR_ACIDDEMONSTRATION##
Modified skills not requiring items:
Enchant Deadly Poison:
378,0,0,60:70:80:90:100,0,0,0,99,0,0,none,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 //ASC_EDP#ƒGƒ“ƒ`ƒƒƒ“ƒgƒfƒbƒhƒŠ?ƒ|ƒCƒYƒ“#
Acid Demo:
490,0,0,30,0,0,0,99,0,0,none,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 //CR_ACIDDEMONSTRATION##