Are you drinking enough water?

6-Minute

arrive at = calculate

Decide on it after doing calculations.

take grip on

take control of
Kiểm soát, nắm bắt

pretty much = almost

almost completely
hầu như, hầu hết

ballpark figure

a number which is a guess but an acceptably accurate approximation

dehydration

condition of not having enough water in your body so that you feel ill or weak

symptom

sign or feeling in the body showing the presence of an illness or disease