How does the text characterize the cost of using bottled water for brushing and rinsing?

Answer

Minimal expense compared to the cost of a single doctor's visit for sickness

The financial outlay for purchasing purified water specifically for oral hygiene routines like brushing and rinsing is presented as a very small investment when viewed in context. The text emphasizes that the cost incurred over a trip, even if using smaller bottles for this specific purpose, barely registers against the overall travel budget. This minor expenditure is explicitly contrasted with the potentially high financial burden and disruption associated with seeking medical attention and treatment for traveler's sickness caused by using unsafe tap water.

How does the text characterize the cost of using bottled water for brushing and rinsing?
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