Many responses have ...

Many responses have recommended chlorine to disinfect. While chlorine is the standard choice for treating water with cholera or better vibrio cholerae it would have a high demand as chlorine gets consumed very rapidly.

It is better to use chlorine dioxide as SCD (Stabilized Chlorine Dioxide) with an Oxy Chlor Generator by dosing the precursor chemicals directly into the water intake pipe. The precursor chemicals are 2.5x more powerful than chlorine. 

Besides this chlorine dioxide will have a longer residual time in the water to prevent other forms of bacterial, viral contamination.

Most importantly when you are treating raw water in a well the raw water has presence of organics (Humic & Fulvic Acids). When chlorine comes in contact with these organics there is production of trihalomethanes, that are known carcinogens (Chloroform). This is also the case if you treat the well water with Ozone. Ozone produces bromides, that are known carcinogens.

Chlorine dioxide when added to raw water do not form trihalomethanes, known carcinogens. 

So while you may eradicate cholera from the well water you are creating other issues.