Folklore around the world is full of tales of lovely female creatures of the sea who attract humans with their sensual nature.
they are also the sentient layer of water. Meaning, they are the thinking aspect of liquid.
So in effect you can easily ask her to charge water or drinks etc.
According to lore, undines bestow the spiritual powers of water, including intuitions, dreams, insight, compassion, spirituality, flexibility, understanding, love, and tenderness.
This is designed to be a servitor creator image, you purchase, then place your item on the circle and say create. A randomized undine type servitor will be made on your item (within 30 mins)