Potable water
Water used in food prep or contact with food must meet the IS:10500 drinking-water standard and be tested at least twice a year, with records kept.
“Only potable water, with appropriate facilities for its storage and distribution shall be used as an ingredient in processing and cooking... Water storage tanks shall be cleaned periodically and records of the same shall be maintained in a register.”
Use potable water for food prep; get it tested at an accredited lab and keep the report on file.
Water test report; tank-cleaning register
Track this requirement, keep the proof in one place, and get reminded when it needs attention.
SabSet maps requirements for clarity. Always confirm against the official source; professional advice may be appropriate.