This is a convenient heading for a variety of short topics, as evidenced by the diversity of material below.
When possible, bathe before performing magic.
A sachet of purification herbs added to the water can be a great help, also.
Dress in clean, comfortable clothing, or nothing at all, as you wish. Some practitioners wear robes and jewelry but this isn’t necessary.
It is also not necessary to abstain from sex, food, or liquids prior to magic.
Do so if you wish, but it simply isn’t a requirement.