Because water is not purified to the same standards in the US, everyone drinks bottled water. Our first week using tap water for coffee and tea (I reasoned that we boiled it first, but only for a few seconds), led to 3 of 5 of us with upset tummies. Now that we cook with and use purified water in the kettle, all has settled down.
The yummy tomato puree to use with my cabbage and rice and ground beef turned out to be ketchup! A bit sweet but not bad.