Having access to a few litres for drinking, cooking and minimal hygiene is still a far stretch away from having no access to clean water.

Typical water use in developed countries ranges between 100 litres and 400 litres a day per person, but you can get by temporarily with as little as 15 litres per person and day. https://www.who.int/teams/environment-climate-change-and-health/water-sanitation-and-health/environmental-health-in-emergencies/humanitarian-emergencies

Fully cutting the water supply like announced is a severe escalation of the humanitarian situation and beyond the “normal occupation stuff.”