Olivia Callan, who was born on the island and runs Olivia’s Kitchen, which has remained open, said the shortage had impacted how they were running the business.
She said tea and Americano were off the menu, adding: “We are asking people to be mindful and have posters up about being mindful of water usage.”
She said milky coffees, canned drinks, alcohol and food were still being served, but customers were asked to use hand sanitiser in the bathrooms.
“I didn’t have a shower this morning, but we can still drink a glass of water.
“Every year if there’s hot weather there’s a water shortage.”
She said ideally more would be put in place to supply water in these situations but added that would be expensive and “not part of the lifestyle on Scilly”.
South West Water (SWW) had sent over “lots of water” she added.