You will need the following items for this spell:
Necklace
Water
None
It will change you into mermaid in 2 weeks time.
First get into a bath and say:
"Dear mermaids from the sea i want to be one of you so change me into it when i wear the necklace and touch water. But when my neck is niket i will only swim up to 100 miles per hour and i will hold my breath for 2 minutes."
But beware:
Headache,tummyache and sickness.