Locally bottled water is clean, affordable, and tastes good. It can be found in grocery stores and petrol stations. Alternatively, you can install an under-the-sink well-water/city-water filter system.
The ‘City Water Filter’ from Ion Faucet removes all the chlorine that is put in desalinated water and the company imports directly to Cayman. See www.ionfaucet.com. A local licensed plumber can easily fit the system under your sink.