The Workplace Health, Safety and Welfare Regulations 1992 answers this best. Regulation 22 places requirements on the employer with respect to the provision of drinking water.

It states:

1. An adequate supply of wholesome drinking water shall be provided for all persons at work in the workplace.

2. Every supply of drinking water required by paragraph (1) shall -
  (a) be readily accessible at suitable places; and
  (b) be conspicuously marked by an appropriate sign where necessary for reasons of health or safety.

3. Where a supply of drinking water is required by paragraph (1), there shall also be provided a sufficient number of suitable cups or other drinking vessels unless the supply of drinking water is in a jet from which persons can drink easily.

So there you have it! The law has spoken!

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