How can I make a spiral, bend or any other shapes in my bamboo?

I suspect you are talking about "lucky bamboo"

This isn't bamboo, nor is it even remotely related to bamboo.

It is Dracaena sanderiana is a species of the genus Dracaena. The species was named after the German-English gardener, Henry Frederick Conrad Sander (1847-1920). It is also known as Ribbon Dracaena, Lucky Bamboo, Belgian Evergreen or sometimes Ribbon Plant

D. sanderiana is one of a group of small, shrubby species with slender stems and flexible strap-shaped leaves that grow as understory plants in rainforests. It is native to Cameroon in tropical west Africa. It is an upright shrub growing to 1.5 metres (5 ft) tall, with leaves 15-25 cm (6-10 in) long and 1.5-4 cm (1-2 in) broad at the base.

It is marketed in the developed world as a Chinese decorative plant "Lucky Bamboo" (although unrelated to Bamboo and not native to Asia), propagated from short cuttings, usually in water.

Dracaena sanderiana and related species are popular houseplants, with numerous cultivars sold. It can survive in many indoor conditions, but indirect lighting is best as direct sunlight can cause the leaves to turn yellow and burn.

Although it grows better in soil, it often is sold with the roots in water. The water should be completely changed every two weeks. The water should be bottled water, soft tap water with very little fluoride, or even water from a filtered, established aquarium. It does best in bright, indirect lighting and temperatures from 15 to 25 °C (59 to 77 °F).

Yellow or brown leaf edges may be caused by too much direct light, crowded roots, or fluoridated or chlorinated water, the latter of which can be prevented by leaving tap water exposed to the air for a day before plant use. Salty or softened water can also cause this.

Twisted shapes can be produced by rotating the plant with respect to gravity and directed light sources. This is difficult to achieve for most home users, but not impossible with a lot of spare time and a lot of patience.

Often in large chain pet shops it will be sold as an aquatic plant. While it will live for months like this, it will eventually rot unless the sprouts are allowed to grow above the surface.

* Dracaena sanderiana is toxic to pets.[2]

* Dracaena sanderiana is used in Feng Shui.

* Dracaena sanderiana can flower in Autumn, Winter, and early Spring.

Trying to continue the spiral growth would be difficult for the average home grower, but you could give it some gentle bends with the following method.

Binding with Tape

Reshape branches by bending them in a sequence of small steps over several weeks or months, binding them with tape to stiff wire rods. -->http://www.learn2grow.com/gardeningguides/housepla...

Gently Hang Weights On The Green Flexible Parts Of The Plant And It Will Bend And Twist Any Way You Want, Make Sure Not To Tie Anything To Tight Or It Could Pinch The Plants And Cause Them To Die.

The best store to check for stuff like that would probably be Target or like a specialty craft store like Jo Ann Fabrics. Or you could ask your mom where to get it too!!

by manipulating the light sources as the bamboo will grow in the direction of the light.

if you put an objet in its way, it will route around it.