Any person supplying water, whether under statutory powers or not, may—
Provided that a sale by a company under this section must be authorised, if the company is a company within the meaning of the Companies Act, 1929, by a special resolution of the members passed in the manner provided in Part IV of that Act, and if the company is not such a company, by a resolution passed by three-fourths in number and value of the members present, either personally or by proxy, at a meeting specially convened for the purpose with notice of the business to be transacted.