Question

whenever Rita Travels she always insist on getting a sealed bottle of purified water normally referred to as mineral water why does she do this?

Answer 1

Rita insists on getting a sealed bottle of drinking water or mineral water, to ensure that the water is indeed safe for drinking.  

Purchasing a known, reputed brand ensures that water has been taken from reliable sources as claimed and bottled under hygienic conditions.  

While travelling, it is advisable to drink clean and purified water obtained in sealed bottles, instead of ordinary tap water, to prevent pathogens in untreated or under-treated water, from entering the human body and causing distress and disease.

Answer 2

to make sure that water is safe for drinking or not