Change water regularly. Completely change your plant's water at least every two weeks. If your plant is having some problems, like insects, algae or stagnating water, change it more often, but never change it more than once every three days.
Use filtered water. Lucky bamboo plants don't like many of the chemicals commonly found in tap water, especially fluoride and chlorine. Filtered water solves this problem, but so can allowing your tap water to sit out for a day or two before adding it to your plant's container.
Choose the correct container. If you're good at remembering to refill your bamboo's water, opt for a decorative ceramic container. If you need a regular reminder, opt for a clear class container. This will provide you a bird's eye view of your water level and your plant's root system. If you use a glass container, you may have to change the water more often as these containers let light in, which breeds algae.
Fertilize rarely. Lucky bamboo doesn't require regular feedings. In fact, you can have your plant for years without ever having fertilized it and it will likely do fine. For optimal care, give your bamboo a few drops of plant food designed for aquarium plants during a water change. Do this no more than every three months or so. If your plant starts to get yellow leaves, it could be a sign of over feeding. Scale back to feeding every six months to a year in this case.
Prune as needed. If you plant gets too large, as bamboo plants are known to do, simply use sharp pruning shears to lop off the top of the plant. Cut above the node (the area above one of the rings, where leaves sprout from). You can apply rooting hormone to this piece and put it in a container of its own. If conditions are right, it will sprout its own roots and make a new plant.