You must go far out into a large body of water away from people. Once you are there recite this magic spell.
magic spirits of the deep
i would like a tail not 2 feet
beauty be upon me
fish all kinds let me see
when im finished in the sea
when im dry my feet return to me
After you recited the powerful spell go under the water till you hit the bottom. Then you start to breath. Your body will gag and fell like your lunges are exploding. This is normal it is your body rejecting the spell. If this happens breath in even deeper again your body will continue to reject the spell. But you must continue breathing in the water. After a few minutes of the process you will start to fall asleep. This means the spell has worked and when you wake up you will be a Mermaid/Merman.