Potion

In many fairytales, magic is involved. The classic plot of disney fairytales involves a witch and a young, beautiful girl who is cursed by said witch until the spell is broken by a true love's kiss. The witch may poison the girl with a potion. She may dip a piece of fruit in a magical potion or even a poison and this allows the witch to have control over the girl's life. Potions could be easily disguised as water or wine and an unfortunate victim may fall into its trap.