After the shower/bath, get some clean clothes and to dont be to tight.
Put some clean water in a boll, and go with it to you magic place ( altar, or a quite room where you feel relaxed and calm, where you stay often and you like it).
Put the vase with water on a table and with your eyes closed put your hands on that vase. With your eyes closed try to see the vase with water in your mind, visualize it. Breath deep and slow and exhale, after you make this simple breathing exercise 5 times try to see with your mind your body covered whit a glowing energy is not importand the color, then focus that energy in to your hands and see whit your mind how that energy floads in to the vase with water and energize it. When you do this say in your mind or loud : I purify this water whit my own energy and with the energy of the univers. May the water element to accept it and to help me, because my intentions are not bad and i dont have an evil porpose. So mote it be! ( Repeat this 3 times and after you finish dont forget to thanks to the univers and to the water element! You can make this every time you want some magic water. Magic water is not only for rituals, you can drink it every morning before you eat and you will become more healty, you will have more energy, and you will feel more better!