Some common precautions are:
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Yes. You can make water filter by using sand and gravel and water tank. Then you can easily make the water germ free by using chlorine. Alternately you can use the chlorine drops to to purify water in your house. This way you can prevent cholera.
Cholera can be stopped by the practice of sanitation, sewage processing, drinking clean water, washing hands and paying attention to any warnings issued by the government in the country you are in.
Hygiene is a big factor here. If proper hygiene is carried out, cholera can be effectively avoided. Wash your hands well with soap after going to the batheroom and before handling food or touching your face. avoid hand contact with strangers. Avoid public toilets. use a reliable water source.