Concidering how there's been cases of people dying from dehydration due to consuming nothing other than energy drinks, at the worse end of the possibilities of not drinking water I'd say it's a common enough thing. I do know for a fact most Americans buy and consume bottled water instead of tap water.

A surprising amount don't but it's not universal. Best case scenario they've substituted all water for sugar water, worst case they've subbed it for soda and energy drinks.

Roughly 155 L of soda per person per year.

https://worldpopulationreview.com/country-rankings/soda-consumption-by-country

Keep in mine that 1) the requirement for an adult is about 750 L per year, amd 2) there are some non-soda-drinkers who are well below the average, and others who are well above it.