People think in dollars, not gallons. The dollarize value is based upon your average rate selected during setup, or your most recently entered water bill. Month to date dollarize displays your estimated spend for the month to date based upon your provided bill information.
To learn about updating your water bill, read this article.
If you would like to speak to a member of the bluebot team, simply navigate to Settings > Support from within the app and choose your preferred method of communication. Otherwise, you can email firstname.lastname@example.org