You can make one by using clean marrentill on a vial of water and then adding ground unicorn horn, This requires level 5 Herblore to make.
Anti-Poison And/or weapon poison can be made using the Herblore skill ( provided you have the levels) or they can be bought off another player.
Antipoisons can be purchased at Jiminua's Jungle Store on Karamja. Or from the Grand exchange which is easier
You use a normal spear (steel or better), and poison it. For this quest, you specifically have to poison it with karambwan paste, which you make during the quest (from a poison karambwan).
There are no free-to-play poisoned weapons in Runescape, no.
No. Poison is a members-only feature.
Poison, i believe.
drink the antidote
around about 50.
all you need to do to get poison off of a weapon is use a cleaning cloth.
no such thing as "anti statt" pots. but if you mean stat restore pots you need a harralander and red spider eggs.
Yes, you can even drug it in Tutorial.
No the Giant spiders don't poison you, the only spiders in the game which are capable of poisoning you are called "Poison Spiders".